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Japanese Folklore through Power, Speed, and Monstrous Beauty

Ittan-Momen is a strange, long cotton-like presence associated with the Ōsumi Takayama region, around present-day Takayama in Kimotsuki Town, Kagoshima Prefecture. In 1938, Kunio Yanagita recorded that something in the form of an Ittan-Momen fluttered at night and attacked people. No color, face, limbs, or voice is given; what remains is the vivid sense of something long moving through the dark. A 1942 dialect collection calls “Ittan-Monmen” a kind of monster and describes it as a cotton-like object about one tan in length that attacks people at night. A tan measures a bolt of cloth, but its dimensions have varied by period, place, and textile; it cannot be reduced to one fixed number of meters. The name evokes a length of cloth long enough to cover a body, flickering like a living thing. Later local materials tell of Ittan-Momen flying in at dusk and winding around a person’s head or neck. Interviews conducted in Kimotsuki Town preserve accounts from Ikenosono, Hami, Gongen-yama, and the banks of the Kimotsuki River, while also noting communities where the story was unknown. This was not one uniform tale across all of Kagoshima, but a presence remembered unevenly in particular parts of Ōsumi. The figure now familiar throughout Japan owes much to Shigeru Mizuki. According to an account published by the Agency for Cultural Affairs, Mizuki gave distinctive designs to yokai named in *Yōkai Meii* whose appearances had not been handed down. Ittan-Momen, too, acquired the recognizable body of a long flying cloth and became known nationwide through manga and animation.

Issun-boshi is widely recognized in modern times as a pure and righteous fairytale hero for children—a "brave little boy who rides in a bowl-boat and defeats oni with a needle-sword." However, his original depiction in the Muromachi period literature *Otogizoushi* reveals a dark hero (or a half-human, half-yokai trickster) overflowing with ambition and cunning, fully willing to employ despicable schemes to achieve social advancement. In folkloric classification, he belongs to the "Chiisako" (Little Child) archetype connected to Japanese mythology. Born from an abnormal prayer by an old couple and retaining a physical stature of merely one sun (about 3 centimeters) no matter how many years pass, this trait indicates he is not purely human, but a "liminal existence" belonging to the realm of the otherworld or divine spirits. The motif of arriving from the waterside (Naniwa Bay) in a bowl deeply inherits the mythological lineage of Sukunabikona-no-Kami, a tiny deity who crossed the sea from the eternal land (Tokoyo) riding in a Metaplexis pod boat. He compensates for his overwhelming physical handicap with abnormal intelligence, glibness, and a lack of ethical constraint. Upon ascending to the capital and infiltrating the mansion of a powerful chancellor, he uses not martial prowess but "scheming" to claim a beautiful princess as his own. Ultimately, by stealing the oni's treasure (the Miracle Mallet), he literally transforms into a "human man of great power." This is no mere adventure tale, but an extremely realistic, Machiavellian story of social upheaval, where a deformed existence at the very bottom of society climbs to the absolute pinnacle using intellect and deceit.

Karakasa-kozou is a pop icon representing Japanese yokai and is synonymous with tsukumogami (object yokai). Its most famous appearance is hopping around on one leg wearing a geta (wooden clog), with one large eye wide open and a long tongue hanging out. However, this iconic imagery did not naturally emerge from folklore; it was artificially shaped by the publishing culture and toys of the early modern Edo period. Umbrella yokai are depicted in the Muromachi period's *Hyakki Yagyo Emaki* (Night Parade of One Hundred Demons Scroll), but there they take the form of humanoid demons wearing closed umbrellas on their heads, differing from the one-legged figure we know today. It was during the late Edo period that the "one-eyed, one-legged" characteristics became fixed through kusazoushi (illustrated storybooks), toy prints, monster playing cards, and kabuki stage props, making it widely loved by the public as a charming and comical monster.

Amabie is a prophetic yokai said to have appeared in the sea off Higo Province in mid-April 1846. Its only known contemporary source is a single kawaraban held by Kyoto University Library; no parallel account from the period has been confirmed. According to the sheet, something shone in the sea night after night. When an official went to investigate, a creature appeared and announced, 'I am Amabie, a being who lives in the sea.' It foretold six years of abundant harvests across the provinces, together with an epidemic, and instructed people to copy its form and show it to others at once before disappearing beneath the water. The text describes its appearance only as 'like the picture.' In the accompanying image it has long hair, a beak, scales, and three leg- or fin-like appendages.

The Itsumade (以津真天) is a gigantic monster bird with a human-like face, a curved beak lined with saw-like teeth, a long serpentine body, and sharp sword-like spurs on its legs. Said to possess a wingspan of up to one *jō* six *shaku* (approximately 4.8 meters), it terrifies people by echoing its eerie cry of "Itsumade, itsumade" ("Until when? Until when?") from the night sky. The primary source of this yokai is an anecdote about an unnamed "monster bird" recorded in Volume 12, "The Matter of Hiroari Shooting the Monster Bird," of the pinnacle of war chronicles, the *Taiheiki* (established in the 14th century). According to the legend, in the autumn of the first year of the Kenmu era (1334), as an epidemic ravaged Heian-kyō (Kyoto) and claimed countless lives, this creature flew above the Shishinden (the Kyoto Imperial Palace) every night, letting out its ominous cry until it was brilliantly shot down by the master archer Oki no Jirōzaemon Hiroari. Crucially, in classical texts, this bird was consistently referred to only as a "monster bird" and lacked a specific proper name. It wasn't until the Edo period that the painter Toriyama Sekien included it in his *Konjaku Gazu Zoku Hyakki* (1779), applying the kanji "以津真天" (Itsumade) to its cry, that it crystallized as a distinct named yokai for the first time. In modern yokai encyclopedias, it is often explained that it "appears beside corpses left abandoned due to war or famine, crying out in protest, 'Until when (will you leave them exposed to the elements)?'" However, this direct connection to "corpses" is absent from medieval and early modern literature; it is a later interpretation added in modern times that logically reinterprets the *Taiheiki*'s backdrop of a rampant epidemic.

A tsukumogami said to arise when an iron cooking cauldron, used for many years, gains a spirit and takes on a humanlike form. The name ties to old beliefs that the rumbling or moaning a kettle makes during cooking could foretell good or bad fortune, with its tones read as omens. In paintings it appears with a cauldron for a head, emerging late at night to make ringing sounds and test people’s hearts.

The Giant Centipede is a monstrous centipede yokai whose carapace is so hard it deflects blades and arrows. Its body is long enough to coil around mountains, its many legs glow a fiery red, and its venomous fangs were said to bite through armor. It is portrayed as an adversary of great serpents and dragons—water deities—with whom it battles in lakes, marshes, and the wilds. Centipedes symbolized fearless resolve and were seen as auspicious by warriors and merchants, though details of this creature vary widely by region.

The Phantom Locomotive is a modern-era yokai tale from the age of steam, in which a train that does not exist appears on the tracks, rushes forward, and vanishes at the last moment. Many accounts explain it as a fox, tanuki, or especially a mujina (badger) transforming into a train to mislead people. After the disappearance, the body of a run-over animal is often found beside the line. The belief reflects a folk interpretation that the novel whistles and rattle of night trains in the hills were the work of shape-shifting beasts.

Oboroguruma is a haunted ox-drawn carriage depicted by the Edo-period artist Toriyama Sekien in Konjaku Hyakki Shūi. On hazy nights it arrives with creaking wheels, a gigantic face peering from where the carriage blinds would be. It is often read as the manifestation of grudges born from Heian-era “carriage disputes,” tied to court processions and the Kamo Festival. Scholars link it to the Night Parade of One Hundred Demons and classify it among haunted tools (tsukumogami).

Katawaguruma is a night apparition of a single ox-cart wheel wreathed in flames, racing down dark roads with a human face glaring from its hub. Recorded in early Edo-period kaidan and essays, it was feared to bring misfortune to those who saw it—and even to those who merely gossiped about it. Accounts differ on whether the face is male or female. Sightings are tied to Kyoto and Omi, and the creature appears in contemporary paintings. Scholars often discuss its connection to the wheel-demon Wanyūdō.

The tengu is a yokai and quasi-divine being said to dwell in the mountains of Japan, a lord of the heights inseparably bound to the yamabushi ascetics of Shugendō. Its forms fall broadly into two lineages. One is the long-nosed tengu, with a ruddy face and high nose, clad in the garb of a mountain ascetic, bearing a feather fan and one-toothed high clogs; the other is the crow tengu, with a crow's beak and wings, and beneath them follow lesser kin such as the leaf tengu and the wood-chip tengu. What was once conceived as a bird like a black kite hardened, over the medieval period, into the image of the long-nosed mountain ascetic. The tengu is at once a demon that obstructs the Buddhist Law and, once subdued, a guardian deity who protects it—this dual nature is the essence of the tengu. The notion that an arrogant high monk falls and becomes a tengu was bound to the Buddhist "way of the tengu," and was depicted as satire in late-Kamakura picture scrolls. Within mountain worship, on the other hand, the tengu was revered as guardian of the mountain and master of martial and magical arts, a being that tests or guides the practitioner. From Mount Kurama and Mount Atago in Kyoto onward, each of the sacred mountains of the realm was said to have its own great tengu, and the early-modern Tengu Sutra counts their number at forty-eight.

Umibōzu is a maritime apparition known along coasts throughout Japan and long feared especially by fishers. A calm sea is said to heave without warning, becoming an immense black shadow or the bald form of a Buddhist monk that blocks a vessel's path. Accounts rarely show a whole body; most describe only a head and shoulders rising above the water. It appears at night or in heavy seas, overturning boats and dragging people into the depths. Edo-period sources including the Wakan Sansai Zue (1712) and the Butsurui Shōko (1775) also record the name of a giant apparition standing at sea.

Ushi-oni appears chiefly on the coasts, in deep pools, and in the mountains of western Japan. It is among the fiercest and most numinous beings in the yokai tradition. Its body has no single form: some artists give it a bull's head on an oni's body, while others set the same head on the body of a spider. The Heian-period Pillow Book already names Ushi-oni among the things that inspire terror. Its most striking quality is a radical dual nature. In one guise, Ushi-oni is a cruel man-eater and bringer of disease that spreads poisonous breath without discrimination. In another, it leads a mikoshi procession and uses its tremendous force to drive away other evil spirits. Over time, a frightening presence in literature became part of regional worship and festival performance. Few yokai show so clearly how a destructive power could also be received as a guardian.

A mysterious beast recorded in the late Edo period as appearing in the mountains of Uonuma, Echigo. The Hokuetsu Seppu (Book 2, Scroll 4) says it was “like a monkey yet not a monkey,” with long hair hanging down its back and a height greater than a person. Rather than harm people, it begged for food and at times helped with human labor, such as carrying loads. Its true nature was unknown—seen as either a mountain spirit or a rare creature—and it lives on in the oral traditions of a weaving region.

A mountain-and-field apparition from Kagase in today’s Ino, Kochi. Its hair blazes a sun-bright red, dazzling to the point that it is hard to look at. It walks on two legs, but its feet are hard to see as it slips through the grass. It is not known to attack people; those who meet it are often overwhelmed by its intense crimson radiance and lose sight of it. The name appears in late Edo to early Meiji yokai picture scrolls and local records.

A yokai name found in Edo-period picture scrolls and board games. It is typically depicted as a hairy face emerging from dark clouds, with a huge tongue and clawed hands. Full-body depictions and clear traits are not recorded. In Toriyama Sekien’s Gazu Hyakki Yagyō it appears above a sluice gate, but without commentary. The name also occurs in contemporary picture-sugoroku like Jikkai Sugoroku and in Hyakki Yagyō emaki. A similar motif titled “Red Mouth” appears in various scrolls. Scholars have suggested links to Onmyodo deities Akashita or the calendrical Akashita day, but no proof exists.

The Golden Crow is a mythical crow believed to dwell within the sun, often depicted with three legs. Chinese classics describe it as the “crow in the sun,” and it entered Japan through Onmyōdō and Buddhist art. The term can serve as a poetic name for the sun, paired conceptually with the Moon’s Jade Rabbit and toad. In images the crow is black, set against a gold-cinnabar solar disc.

A nocturnal apparition in which a heron’s body appears to glow pale blue. Also called Goi no Hi and Goi no Hikari. Recorded in Edo-period picture books and essays, it was seen on moonlit and rainy nights. Often identified as the black-crowned night heron (goisagi); in flight it looked like blue flames, startling onlookers. Explanations include reflections from wet plumage or substances along the water’s edge, yet many locales remember it as a ghostly fire.

Gashadokuro is a modern yōkai known as a gigantic skeleton that walks across night fields. Its name does not appear in old village oral traditions or Edo-period yōkai picture books. The earliest presently verified starting point is “A Guide to Japanese Yōkai Around You,” an unsigned article written by Saitō Morihiro in the September 1966 issue of Bessatsu Shōjo Friend. Ryūhei Hirota’s research identifies Saitō as the creator of the yōkai, finds no earlier historical record, and shows that Shigeru Mizuki included it in a yōkai collection two years later as though it belonged among established beings. It is a representative creation of postwar publishing culture, one that challenges the assumption that only inherited, ancient beings can be yōkai. The securely documented core of its early image is a giant skeleton walking across open country. Because the full first article is not publicly available, details visible in scholars’ transcriptions—rattling bones, skulls of people who died by the roadside gathering together, and attacks on people—must be distinguished from settings added by later media. Resentment of war dead or famine victims, blood-drinking, dawn, talismans, and memorial rites likewise cannot all be projected back onto old tradition without establishing which medium said what and when. The hiragana name *gashadokuro* suggests the sound of bones striking one another, but the formal bibliographic record of the first article gives the spelling がしゃどくろ; 餓者髑髏 is a later ateji spelling and must be kept distinct. The image now most readily associated with Gashadokuro is Utagawa Kuniyoshi’s triptych *Sōma no Furu-dairi*. Yet the print predates the yōkai’s creation by about 120 years. Around 1845–46, Kuniyoshi adapted Santō Kyōden’s *Uto Yasukata Chūgiden* and depicted a skeleton summoned by Princess Takiyasha’s sorcery confronting Ōya Tarō Mitsukuni, replacing the several skeletons of the source with a single gigantic one. The skeleton in the print is not named Gashadokuro. Kuniyoshi did not portray that yōkai; postwar yōkai publishing joined a famous image of a giant skeleton to a new yōkai image. The process of giving an earlier image a new name, then having encyclopedias, manga, television, and games share that combination, clearly shows how yōkai continue to be made in the modern era. Gashadokuro’s significance does not lie in false antiquity. A name born in a single Shōwa-era article met a late-Edo image, older ideas about the dead, and the postwar horror boom, becoming a widely known Japanese yōkai in little more than half a century. That process of formation is the giant skeleton’s most firmly documented story.

The Nine-Tailed Fox is a spirit-fox said to have lived so long and gathered so much power that its tail divided into nine. Yet the name does not simply mean a fox with many tails. In Japanese yokai imagery, the Nine-Tailed Fox is the largest and most complicated fox figure of all: it joins fox worship, Inari belief, fox possession, tales of beauties who unsettle royal power, and the narrative line that runs from Tamamo-no-Mae to the Sesshoseki killing stone. Its source lies in Chinese antiquity. In the Nanshan jing section of the Shan Hai Jing, Mount Qingqiu is home to a beast shaped like a fox, with nine tails, a cry like an infant, and a taste for human flesh. This fox is monstrous; yet in ancient China the nine-tailed fox could also be a propitious beast, an omen of peace. Later Chinese and Japanese texts layered the auspicious fox and the bewitching fox onto one another, turning the nine-tailed fox into both a sacred beast and a nation-ruining spirit. In Japan, fox lore spread in two directions. On one side stood the white fox, messenger of the Inari deity, guardian of fields, business, and household prosperity. According to Fushimi Inari Taisha, Inari descended on Mount Inari in 711, and the faith now extends to roughly thirty thousand shrines across Japan. On the other side stood the wild foxes and possessing spirits that deceive people, cling to households, or take hold of a region: yako, kuda-gitsune, osaki, izuna, and others. The Nine-Tailed Fox stands between these poles. It has the noble aura of a near-divine white fox, but also the danger of entering human society from within and shaking power itself. In Japan, the figure was fixed above all by the stories of Tamamo-no-Mae and the Sesshoseki. Tamamo-no-Mae is told as a peerless beauty loved by the retired Emperor Toba; exposed as a fox, she flees to Nasu, is slain, and becomes a poisonous stone. The three names are related, but they are not interchangeable. The Nine-Tailed Fox is the true form; Tamamo-no-Mae is the courtly incarnation; the Sesshoseki is what remains after death. Once those stages are joined, the fox is no longer just an animal that tricks humans. It becomes a great spirit-fox carrying beauty, intellect, politics, death, and pacification.

Tamamo-no-Mae is a beauty of unrivaled grace who, in the late Heian period, is said to have served the retired Emperor Toba. Her true form is held to be a nine-tailed fox, yet as a human, Tamamo-no-Mae has above all been remembered as a court lady of rare beauty and deep learning. Poetry and music were a given, but from Buddhist scripture to the old tales of India and China, she answered any question without hesitation, astonishing all at court. The name “Tamamo-no-Mae” carries a story of its own. One night, amid a banquet of poetry and music at the Seiryōden, a gust of wind snuffed out the lamps; in the darkness a dazzling light streamed from her body and lit the hall as bright as day. From this she came to be called “Tamamo-no-Mae,” meaning the lady of the jewel-like, glowing waterweed . Before that, it is said, she had been called Mikuzume. In time she drew all the emperor’s affection to herself, but when he fell ill from an unknown cause, her true nature began to be doubted.

The Kodama Mouse is a mountain anomaly told among Matagi hunters of northern Akita. It looks like a tiny, round-bodied mouse—somewhere between a house mouse and a dormouse. When it meets a person, it stops, swells rapidly, and is said to burst with a gun-like boom, scattering flesh—though some accounts say it only makes a deafening blast without bursting. The encounter was read as a sign of the mountain god’s anger; hunters who saw it were to stop hunting and leave the mountain at once.

A shaggy, seldom-seen yokai sketched by Toriyama Sekien in Konjaku Hyakki Shūi. Sekien glosses its name as “Keu-kemi” (written 希有希見, “rarely seen”), underscoring its elusiveness. He likens its form to a hair-covered “hair-woman,” yet offers little on its nature or habits. Later writers proposed it lurks in damp corners of houses, but Edo-period sources do not confirm this.

Kodama, often searched in English as “kodamas,” are Japanese tree spirits: presences believed to dwell in old trees, or sometimes in the trees themselves. In older belief, a tree that had lived for many generations could hold a sacred presence, and the delayed voice that returns from a mountain or valley, known as yamabiko, was also understood as a reply from the kodama. The idea reaches back toward Japanese tree divinity: some interpretations connect kodama with Kukunochi, the tree deity named in the Kojiki, while the Heian-period dictionary Wamyo Ruijusho records “Kotama” as a Japanese name for a tree god. Genji monogatari also places kodama among beings that are hard to separate cleanly from oni, kami, or fox spirits, showing that the word already carried an uncanny, yokai-like edge in the Heian imagination. A kodama usually does not look like a separate monster; it may be indistinguishable from an ordinary tree, yet the tree is feared as charged with spirit, and careless felling could bring misfortune. Toriyama Sekien’s Gazu Hyakki Yagyo illustrates this under the title Mokumi, explaining that a god appears in a tree more than a hundred years old and drawing aged human figures beside an ancient trunk. Written as 木霊, 木魂, 木魅, or 谺, kodama sits at the meeting point of tree soul and echo: the forest speaks back, and the tree is imagined as the one answering.

The Kotofurunushi is a tsukumogami (an artifact that has transformed into a yokai) born from an old koto, depicted in the Edo-period yokai bestiary *Hyakki Tsurezure Bukuro* by the artist Toriyama Sekien. Its visual design is highly striking: sorrowful eyes and a mouth emerge on the surface of an old, broken koto that has been abandoned for years, with countless snapped strings hanging down like the tangled hair of a deranged female demon. This is not merely an anthropomorphized object, but a visualization of the intense grudge of an instrument—a tool whose sole purpose is to produce sound—being forced into silence and left to rot. The deepest charm of this yokai lies in the cruel paradigm shift of Japanese music history hidden within Sekien's commentary accompanying the illustration. Sekien wrote: "Since the blind man Yatsuhashi reformed the melodies, the Tsukushi Koto exists in name only, and those who know its sound are exceedingly rare..." This refers to Yatsuhashi Kengyo, a genius blind musician of the early Edo period. Yatsuhashi Kengyo learned the traditional playing methods of the ancient "Tsukushi Koto," which had previously been played elegantly among aristocrats and monks primarily in northern Kyushu, and dramatically reformed it into a modern style (Sokyoku), gaining immense popularity. However, as the price for Yatsuhashi's new style sweeping the world, the good old "Tsukushi Koto" became completely obsolete, forgotten by history with no one left to play it. In other words, the Kotofurunushi is not just a monster of an old instrument; it is the incarnation of the sorrowful resentment of "loser's art" (the music of an old school)—eliminated by the advent of a genius (Yatsuhashi Kengyo) and left without an audience. It is an extremely cultural and musicological yokai.

Kinrei is the embodiment of the essence of gold, or a spirit symbolizing fortune and virtue, believed to appear as a sign to households that practice good deeds. Edo-period picture scrolls depict it as storehouses brimming with gold and silver—more an allegory of auspicious news than a tangible monster. Kintama, by contrast, is said to arrive as a glowing sphere or strange fire; welcoming it brings prosperity, but harming it invites decline. The two are sometimes conflated, though their characterizations differ slightly.

Kama-itachi are yokai said to ride dust devils or sudden whirlwinds, slicing human skin as if by a blade. Victims often feel little pain at first and may not bleed until later. From the Edo period on, they’re depicted as weasels with sickle-like claws, though explanations vary by region—some attribute the cuts to the phenomenon itself, to wind deities, or to minor spirits. The term is also a classical winter seasonal word.

The Sandworm does not appear in any classical Japanese yokai picture scrolls or folktales; it is, so to speak, a "modern imported yokai." It is known as a giant worm monster that digs through the underground of deserts and sand dunes at breakneck speed, swallowing prey whole along with the sand using its massive, cylindrical mouth. Its direct origin is definitively traced to the Sandworms (Shai-Hulud) appearing in Frank Herbert's 1965 monumental sci-fi novel *Dune*. However, since the 1980s, its recognition exploded in Japan through fantasy RPGs like *Final Fantasy*. It has completely taken root among Japanese youth as a shared terrifying experience (a kind of modern folklore) as "the most terrifying monster that surely lurks in the harsh environment of a desert," making it an anomaly with an extremely unique history of reception.

Suzaku, the Vermilion Bird, is one of the Four Symbols that guard the south, the numinous bird that shapes the seven southern lunar mansions of the heavens into the form of a bird. In the Five Phases it is assigned to Fire, in the five colors to vermilion (red), and in the seasons to summer. In the classics it is often written "Vermilion Sparrow," and the "Qu Li" chapter of the Book of Rites makes the Four Symbols markers of direction—"the Vermilion Bird in front, the Black Tortoise behind." Received into ancient Japan together with the Chinese thought of direction and the Five Phases, its name remains in the Suzaku Avenue and Suzaku Gate of Heian-kyō.

A tsukumogami-like figure from Toriyama Sekien’s Hyakki Tsurezure Bukuro: ceramic vessels and utensils gather to form an armored warrior. It plays on the aesthetic contrast between Karatsu ware and Seto ware, depicting utensils as rival factions. The motif is not based on oral lore or local tradition; Sekien’s image and accompanying verse are the principal sources.

A yokai depicted by Toriyama Sekien in his Hyakki Tsurezurebukuro. It takes the form of a tattered cloth billowing like a dragon in the wind; Sekien glosses it as “an old wiping cloth that has transformed.” The name is thought to pun on “Shirōururi,” a figure from Essays in Idleness (Tsurezuregusa). It is generally understood as a tsukumogami created by Sekien’s design. The work does not detail specific harms or behavior, and later interpretations often add their own ideas.

Sazae-oni appears in Toriyama Sekien's Hyakki Tsurezure-bukuro (1784) as a turban shell that has aged into an oni. Human arms extend from its shell, while an eye grows on the operculum. Sekien's caption quotes the old transformation lore that 'sparrows enter the sea and become clams, while field mice become quail', a line derived from the monthly observances in the Chinese Book of Rites. If the classics allow a sparrow to become a clam and a mouse to become a quail, why should a turban shell not become an oni? The creature is therefore an idea and a pictorial conceit born from wonder at the transformations of nature, rather than a report of a local encounter. Sazae-oni gives visual form to the principle that a natural thing can pass into an uncanny state. Some Hyakki Yagyō picture scrolls also show a shell-like yokai leading a smaller clam creature by the hand, placing Sekien's invention within a larger procession of personified beings from the shore.

Shuten-dōji is the central figure in medieval oni-slaying tales that pit an oni king, who carries people away from the capital, against warriors sent into the mountains by imperial command. The stories are set in the reign of Emperor Ichijō and include the historical commanders Minamoto no Yorimitsu and Fujiwara no Yasumasa, but they are not contemporary Heian-period records. The Important Cultural Property *Ōeyama Ekotoba*, held by the Itsuō Art Museum, is the oldest surviving picture scroll of the Ōeyama tradition; it was made in the fourteenth century, during the Northern and Southern Courts period. Reading the Heian setting separately from the work's medieval creation prevents the tale from being mistaken for a record of an actual bandit suppression. Instead, it reflects the world later audiences imagined through Heian warriors and an oni king. His name, too, has never had a single spelling. *Ōeyama Ekotoba* chiefly writes 酒天童子, and the dōji himself says that his retainers call him Shuten-dōji because of his deep love of drink. Other spellings include 酒伝童子 and 酒顛童子 (酒顚童子); 酒呑童子 is now the most widely used. The word *dōji* alone does not establish a particular age, hairstyle, or clerical status. In the Noh play *Ōeyama*, the first-half shite appears in the guise of a youth, while *Ōeyama Ekotoba* portrays his daytime form as a dignified figure about one *jō* tall. The tale broadly divides into a tradition that places the oni king at Ōeyama and another that places him at Mount Ibuki in Ōmi Province. The *Shuten-dōji Emaki* (酒伝童子絵巻) at the Suntory Museum of Art, made in 1522, is considered the oldest surviving example of the Mount Ibuki tradition. These are not simply the same story with one mountain name substituted for another: the cast of characters, the name of the sake, and the oni king's appearance and past all differ among copies. Accounts of Ōeyama, Mount Ibuki, Echigo, and Oinosaka therefore cannot be joined into one certain biography for a single Shuten-dōji. In the oldest text of the Ōeyama tradition, disappearances continue in the capital until Abe no Seimei's divination points to the oni king of Ōeyama. Imperial orders go to the two commanders Yorimitsu and Yasumasa, who head for the mountain with their retainers. Reducing the story to the later, familiar tale of Yorimitsu and his Four Heavenly Kings obscures the structure of the early copies. In the mountains the party receives yamabushi dress and special sake from manifestations of deities and buddhas, enters the oni castle, and joins the dōji's banquet. By day the oni king takes the form of a dōji about one *jō* tall, displaying dignity and wisdom; at night he becomes an oni roughly five *jō* tall. His head and torso are red, his left foot black, right hand yellow, right foot white, and left hand blue; he has fifteen eyes and five horns. Once he has grown drunk and fallen asleep, the divine manifestations hold him down and Yorimitsu, Yasumasa, and their followers cut off his head. The head still flies through the air and bites the three helmets Yorimitsu wears one over another. Shuten-dōji is not merely a straightforward evil oni overcome by drink. He receives guests as the master of a splendid oni castle and tells of his own wanderings, even as he uses his captives for food. Courtesy toward guests and cruelty, intelligence and an immense oni body, defeat and the flying head stand together in the same story. Noh, *otogi-zōshi*, picture scrolls, printed books, jōruri, and kabuki each circulated different images of Shuten-dōji. Toriyama Sekien also depicted Shuten-dōji, under the spelling 酒顛童子, in his 1779 *Konjaku Gazu Zoku Hyakki*, placing the drunken, reclining dōji and other oni on a page of his yōkai picture book. Rather than a monster fixed in a single form, Shuten-dōji is one of Japan's best-known oni kings, retold through manuscripts, performing arts, and the memories of particular places.

Shōki is a demon-banishing deity originating in Chinese folk religion. In Japan he is venerated as a protector against smallpox and epidemics, and as a patron of academic success. He is portrayed with a long beard, dressed in official court robes, wearing a sword, and glaring demons into flight. He appears as early as late Heian-period apotropaic paintings, and later became a common motif for Boys’ Day and year-end or New Year talismans in hanging scrolls, dolls, and roof ornaments.

Suzuhiko-hime was named and pictured by Toriyama Sekien in the final volume of Hyakki Tsurezure Bukuro, published in 1784. In the 1805 reprint held by the National Diet Library, she leans over a railing and offers an opened fan. Her head is layered with forms resembling small bells and their long cords, blurring the boundary between face and ritual implement. Despite the “hime” in her name, no record identifies her as the ghost of a particular princess, a deity enshrined at a shrine, or a female apparition known in local tradition. She is a yokai introduced in a single illustration by Sekien. Sekien’s caption recalls Ame-no-Uzume performing kagura before the rock cave in an effort to draw out the hidden deity. It is a brief, dreamlike allusion, not an origin tale for Suzuhiko-hime. In the rock-cave episode of the *Kojiki*, Ame-no-Uzume uses bamboo leaves and an overturned tub; kagura bells do not occur in the text. Suzuhiko-hime therefore cannot be identified as Ame-no-Uzume herself, her transformation, or a bell from the myth. Bell-carrying creatures also appear in earlier copies of Hyakki Yagyō Emaki. A mid-Edo manuscript in the National Diet Library depicts a birdlike figure holding a cluster of bells. Hidekazu Imai describes a related image as “a crane in miko dress holding bells”. The figure is not named Suzuhiko-hime, and it cannot be proved to be the same being as Sekien’s; the connection is a shared visual idea joining a miko, a bird, and bells. No primary source gives Suzuhiko-hime a fixed place of appearance, harmful act, benefit, personality, weakness, or method of defeat. Calling her broadly an implement yokai or tsukumogami does not license a personal tale in which a century-old bell changes from resentment. What can be firmly traced is a female figure incorporating the form of bells, an open fan, a caption longing for Ame-no-Uzume’s ancient performance, and an image later quoted by artists.

Taira no Masakado was a warrior of the Kanmu-Taira line who held sway over the Bandō region in the mid-Heian period, a man who raised the banner of revolt against the court, styled himself "New Emperor" (Shinnō), and was struck down. After his death, the uncanny tales surrounding his severed head made him one of the most dreaded vengeful spirits in Japan, and in time he was enshrined as a guardian deity of the Kantō and a goryō god at shrines such as Kanda Myōjin. In the Jōhei and Tengyō years, Masakado rose from private feuds within his own clan, and in the second year of Tengyō (939) he overran the provincial seats of Hitachi and other Kantō provinces to subjugate the eastern lands, proclaiming an oracle of Hachiman Daibosatsu and styling himself New Emperor . But the following year, the third of Tengyō (940), he was shot in the forehead and killed in battle by the punitive army of Taira no Sadamori and Fujiwara no Hidesato (Tawara Tōda). His life is recounted in detail in the contemporary war chronicle Shōmonki. What made Masakado a yokai and a vengeful spirit was less the historical revolt itself than the legend of the head, told in later ages. The story that his head, exposed in the capital, would not rot and cried out night after night before flying off to the east is bound up with the dread of the Masakado Grave-Mound (the "Head Mound") at Ōtemachi in Tokyo, and transmits to this day the belief that to move it brings a curse. At Kanda Myōjin, by contrast, he is fervently revered as the great tutelary of Edo and a god of martial fortune and thriving commerce—embodying the two faces of a goryō god: curse and protection.

Taimatsumaru is a fire-bearing bird yokai depicted in Toriyama Sekien’s Hyakki Tsurezure Bukuro. Shown as a raptor wreathed in flames from beak and talons, it casts uncanny light across the deep mountain night. Sekien links it in his notes to the glow of the “tengu pebbles,” interpreting it as a force that hinders ascetics in training. Its fire is not a practical torch but a delusive flame that leads night travelers astray. No specific historical locations of appearance are recorded.

A name found in the Edo-period artist Toriyama Sekien’s Konjaku Hyakki Shūi, depicting the aspect of Fudō Myōō manifesting within a waterfall. Sekien annotated it as “appearing from plunge pools across the provinces,” citing the Qinglong shu to state it “subdues all demons and obstacles.” Rather than a yokai proper, it is regarded as a visual emblem of Myōō worship manifesting at waterfalls; the title itself appears to be Sekien’s coinage. Detailed tradition is scarce, and regional aliases or concrete cases are unknown.

A yokai depicted by Toriyama Sekien in Hyakki Tsurezure Bukuro. It shows a small goblin, monk-like in a komusō style, popping out of a box with a sake choko cup perched on its head. Sekien’s note alludes to the Tang-era tale of an ink spirit appearing before Emperor Xuanzong, hinting that this creature belongs to the same family of animated objects. The name combines bōzu imagery of mendicant Zen monks (kōro/boro/“kure-boro” wordplay), the komusō-like appearance, and the sake cup (choko), suggesting a half-monk, half-lay figure born of punning and visual play.

Tsunohanzō is a tsukumogami—an animated household object—depicted by Toriyama Sekien in Hyakki Tsurezure Bukuro as a lacquered ceremonial washbasin (kakutsubo/tsuno-darai) turned uncanny. Once used in the Heian court for cosmetics and handwashing, the vessel is said to gain spirit through long use and human intent, filling with water at night to reveal and wash away written characters. Many portrayals reference the legend of Ono no Komachi washing papers to expose truth from falsehood.

Tsurube-bi is a mysterious fire that moves up and down from treetops at night like a hanging bucket. It appears in Toriyama Sekien’s Gazu Hyakki Yagyō, interpreted as the fiery apparition from Kyoto’s Saiin noted in Edo-period ghost tales. In Shikoku and Kyushu, it’s said to be a wood spirit turning into a bluish-white fireball that dangles from branches. The flames do not burn things, and faces of people or animals sometimes appear within. Considered a type of will-o’-the-wisp, it’s often reported on quiet mountain paths.

A legendary lunar beast seen in the dark markings on the full moon, interpreted as a rabbit. Spread through Buddhist paintings and tales, it became an emblem of the moon deity. In Chinese lore it pounds the elixir of immortality; in Japan it is said to pound rice cakes (mochi). Art historical records note its presence from the medieval period, with the mochi-pounding image becoming common by the mid-Edo era.

The Human-Faced Tree is a strange tree said to bear blossoms like human heads. It appears in Toriyama Sekien’s Konjaku Hyakki Shūi and in Wakan Sansai Zue, which cites the Chinese Sancai Tuhui. The flowers do not understand speech; when addressed, they only smile. If they keep laughing, the blossoms wither and fall. The creature is known more as a bibliographic, proto-natural-history marvel than as a native Japanese folk belief.

A yokai famed as an invisible wall that blocks travelers on night roads. People suddenly find they can’t move forward, their hands meeting a flat, unyielding surface. The spell is said to break if one waits, sidesteps, or taps the ground with a cane. Its form is unfixed—often described as unseen or like a featureless wall. It rarely harms beyond causing confusion, feared mainly as a nuisance that makes people lose their way.

A lantern yokai depicted by Toriyama Sekien in Hyakki Tsurezure Bukuro. Tied to a bamboo pole, the torn lantern gapes like a mouth and droops over a path. The inscription hints it might be mistaken for a rice‑field lantern fire—or even foxfire—but Sekien groups it among animated tools, marking it as a tsukumogami, a lantern that has come to life. Sekien also notes the name as “不々落々,” though it is generally written “不落不落.”

Furu-Utsubo is a tsukumogami—an animated household object—depicted by Toriyama Sekien in Hyakki Tsurezure Bukuro as a quiver (utsubo) that has aged into a wandering, anthropomorphic being. The quiver, a back-worn case for arrows, is shown moving under its own power after long years of use. In his caption, Sekien alludes to the warriors Miura-no-suke and Kazusa-no-suke who shot the “field fox” of Nasu Moor, hinting that an old quiver of theirs may have transformed. The image follows the lineage of weapon-bearing object-spirits seen in Muromachi-period Hyakki Yagyō picture scrolls.

Houki is originally not a Japanese yokai, but a colossal and ferocious wild boar monster (or divine beast) recorded in ancient Chinese mythology and geographical texts such as the *Classic of Mountains and Seas* (Shanhaijing). Pronounced "Fengxi" in Chinese, it became established in Japan through its Sino-Japanese reading "Houki". According to legend, it is an impossibly massive boar completely covered in a hide as hard as armor. It was feared as a living disaster, using its overwhelming power to ravage farmlands and devour people. In Japan, it was introduced to the educated class via "tales of foreign lands" in Edo-period encyclopedias like the *Wakan Sansai Zue*, but it never developed into a folk belief (folk yokai) rooted in local regions. For a long time, it remained merely an "imported monster" confined to the pages of books. However, in modern times, its name has suddenly been thrust into the spotlight through pop culture media such as manga and anime.

Hossumori is a tsukumogami—an artifact spirit—said to arise from a monk’s fly-whisk (hossu) used in Zen practice. In Toriyama Sekien’s Hyakki Tsurezure Bukuro, it is shown seated in full lotus beneath a canopy, absorbed in zazen. Sekien alludes to the Zen kōan of “a dog’s Buddha-nature,” suggesting that even a humble ritual tool can manifest Buddhahood. It embodies the idea of a long-used sacred implement gaining numinous presence and sitting in stillness to pursue enlightenment.

Bakotsu is a *mukuro* (corpse) yokai said to be the animated skeletal remains of a horse that burned to death in a fire, having absorbed eerie spiritual energy after being denied a proper burial. It is famously depicted in the *Tosa Obake Zoshi* (Tosa Yokai Scroll), produced in Tosa Province (modern-day Kochi Prefecture) during the mid-to-late Edo period. It possesses a bizarre and uncanny appearance: a gigantic, fully skeletonized horse standing upright on two legs, draped in tattered, threadbare rags around its waist. Among the many yokai traditions across Japan, it is extremely rare for a “horse skeleton” to move autonomously. Rather than being a malevolent, vengeful spirit that actively attacks or curses humans, Bakotsu embodies the regret of livestock meeting an untimely end and the sorrow of “beasts of burden” cast aside the moment they outlive their usefulness. Though an apparition that startles travelers on old night roads, it serves as a cautionary tale emphasizing the importance of *chikusho kuyo* (memorial services for animals) and the ethical duty to respect living creatures to the very end. Thus, it strongly reflects the localized folk beliefs and views on life and death of the Shikoku region.

Bone Woman is a skeletal female yokai depicted by Toriyama Sekien in Konjaku Gazu Zoku Hyakki. In his notes, Sekien cites otogizōshi-style ghost tales in which a woman bearing a peony-patterned lantern visits her lover, drawing on the female specter from Asai Ryōi’s Otogibōko story “Botan Dōrō.” The image embodies a beauty who approaches a man but is in truth bare bones—a visualization of the uncanny where desire and death intersect.

A water-dwelling yokai depicted in the late Edo-period picture scroll “Bakemono-zukushi Emaki.” It appears as a seashell with an eye and a tail-like protrusion, shown leaping about. No caption accompanies the image and the artist is unknown. Counted among eleven creatures unique to this scroll, it bears a written reading of its name, implying it was not widely known. No specific harm or blessing is recorded; it is portrayed simply as an uncanny presence near waterways.

A yokai of Buddhist ritual implements depicted by Toriyama Sekien in Hyakki Tsurezurebukuro. It appears as a wooden fish (mokugyō) bearing a bearded face like Bodhidharma (Daruma), seated on a round cushion with eyes wide open. Sekien hints it is akin to the Buddhist-tool spirit Harisumori. Because fish were believed never to sleep or close their eyes, the mokugyō symbolizes sleepless diligence in monastic practice. Linked with the legend of Bodhidharma’s nine years without sleep, it is read as a visualization of the ideal of wakefulness.

A yokai depicted by Toriyama Sekien in Konjaku Hyakki Shūi. Countless eyes appear across the paper screen doors of a dilapidated house, staring back at intruders. Sekien’s note suggests a go player’s obsession spread from the board to the entire house, framing it as a haunt residing in the shoji itself. Later encyclopedias call it a literary creation, yet it endures as an emblem of the eerie patterns and dim light cast through shoji screens.

Mugidono Daimyōjin is a deified guardian venerated in the Edo period as a protector who repels measles. He appears frequently in measles talismans and prints, typically shown trampling a demon that embodies the disease. Such images were posted in homes as protective charms. Prints circulated with prayers for warding off illness alongside convalescence advice and dietary taboos, offering reassurance against a feared epidemic. No specific shrine lineage is certain, and depictions vary by publisher.

A chieftain who commands legions of yokai in the mid-Edo ghost chronicle Inō Mononoke-roku. In 1749, he harried the youth Inō Heitarō of Miyoshi for thirty nights, finally appearing as a samurai of about forty and giving his name. He insisted he was neither tengu nor fox, explaining that Heitarō’s ordeal was part of a contest for the mantle of demon king. His name varies across manuscripts, and paintings sometimes render him like a three-eyed crow-tengu, but his true nature remains unresolved.

Rokurokubi is known as a yōkai whose neck stretches unnaturally long at night. Read older books in chronological order, however, and no single form emerges. Under the same name gather figures close to the nukekubi, whose heads separate completely and fly; people who experience the event only as a dream; bodies and heads that appear linked by a thin line; and figures able to lengthen a long neck at will. The earliest currently identifiable candidate for the name is "rokurokubi" in volume two of the haikai anthology *Takatsukuba*, listed by the *Nihon Kokugo Daijiten* as an example from 1638. Yet surviving bibliographic records also date the book to 1642, so the original must be checked again before calling it an absolute first appearance. The name "Rokurokubi" appears in *Seishō Senku* in 1648, and the title "Rokurokubi of Fuchū in Echizen Province" appears in *Shokoku Hyaku Monogatari* in 1677. These early examples show that the name was spreading from the middle to late seventeenth century. In *Sorori Monogatari*, set in Echizen, a man meets a woman's head on a night road and follows it; when the head flies into a house, the sleeping woman says she has dreamed the frightening dream of being pursued by him. Ashamed of her own deluded thoughts, she enters Buddhist practice, but the story does not say she became a monster through jealousy. The strange event is one in which a person's mind or soul seems to have left the sleeping body. China's *Soushen ji* includes a woman of the Luotou people whose head flies by night and returns to her body at dawn. In the *Youyang zazu*, the Feitou Liaozi develop a ringlike red mark on the neck, sprout wings from the head, and eat crabs and earthworms. These closely resemble Japanese detached-head forms, but they do not prove that Chinese tradition simply became a Japanese yōkai. In Japan, knowledge from Chinese texts, ghost stories, illustrated books, and comic kibyōshi overlapped to shape several images of the rokurokubi. The 1737 *Hyakkai Zukan* depicts a nukekubi, while Toriyama Sekien's *Gazu Hyakki Yagyō*, first published in 1776, presents Hitōban (飛頭蛮) with the reading "rokurokubi". In Sekien's image, a sleeping woman's body and floating head are joined by a slender line. One study argues that such lines were later represented as elongated necks. In *Kyōgen Suehirogari* (1788), the neck of a woman in love stretches from Edo to Kamigata, producing laughter rather than fear. Lafcadio Hearn's "Rokuro-Kubi," included in *Kwaidan* in 1904, is not about a beautiful woman with a long neck. Kwairyō, a samurai turned monk, meets five headless bodies and five heads flying through woods in the mountains of Kai; he moves one body to prevent a head's return and fights the attacking head. Its direct source story is an episode in volume four of Jippensha Ikku's *Kaibutsu Yoron*. The red writing, the tactic of moving the body, and power limited until dawn belong to this particular line of tales.

Ryūjo, the Dragon Maiden, is a dragon connected with water who assumes the form of a woman. She is said to appear beside rivers, lakes, springs, and the sea, often as a beautiful stranger. Some encounters bring a gift or rescue; others inspire fear. Because she is associated with weather and the amount of water in a river or reservoir, she may also receive prayers for rain or for prolonged rain to stop. Ryūjo moves between human and dragon forms. A patch of scales, the trace of a claw, an unusual fragrance, or clothing that never quite dries may reveal what she is.

Paper Dance is a yokai name given to a phenomenon where scraps of paper lift and drift through the air on their own. In the early Showa era, Fujisawa Eihiko’s Illustrated Anthology of Yokai (Japan, Vol. 1) notes it appears in the tenth month (Kannazuki) and uses an illustration of the nose-paper apparition from Inō Mononoke Roku. Later handbooks treated it as a proper-named yokai, but folklorist Kenji Murakami frames it as a recurring incident within ghost tales rather than a distinct entity.

Shōrōkaze, the “spirit-wind,” is a baleful breeze said to blow on the morning of the sixteenth day of Obon. It has no visible form, yet those struck by it were feared to suffer sudden fever, chills, or dizziness. Here “shōrō” means the spirits of the dead in Buddhist usage, and the wind is understood as the current that carries the departing souls at Obon. In the Goto Islands, people traditionally avoid graves and grave paths on this day to ward off spiritual harm.

Suiko-sama is a water deity worshipped in the Tsugaru region of Aomori as a guardian against drowning; the formal name is "Suiko Daimyōjin". Counted among the retinue of the Dragon Palace (Ryūgū), it is described both as a higher being that commands the local kappa — here called *medochi* — and, in other tellings, as a kappa itself. Its sacred images are enshrined in small wayside shrines and halls, sometimes in the form of a kappa and sometimes borrowing the form of Benzaiten. In early summer by the old lunar calendar, people offered the first cucumbers of the year and set them adrift on the river, praying that their children would not lose their lives to the water. It shares only its written name with the Chinese "suiko" of the materia medica; in truth it is a water-deity faith that grew up on its own in Tsugaru.

Byakko, the White Tiger, is one of the Four Symbols that guard the west, the divine beast that shapes the seven western lunar mansions of the heavens into the form of a tiger. In the Five Phases it is assigned to Metal, in the five colors to white, and in the seasons to autumn, and it is represented as a fierce white-furred tiger. Arising from Chinese astral and Five Phases thought, the Huainanzi's "Treatise on the Patterns of Heaven" makes the beast of the west the White Tiger. After it was received into ancient Japan, it formed a pair with the Azure Dragon and was depicted as a marker of directional protection and of wards.

A spirit said to dwell in ema—wooden votive plaques dedicated at shrines and temples. Imbued with the power of long-held prayers and collective intent, it appears as an old man or a beautiful woman. Its form and aura shift to match the subject painted on the plaque. It is known to visit people in dreams or drowsy moments, foretelling fortune or misfortune and admonishing the proper treatment of ema. Though a tool-spirit, its numinous nature is viewed as linked to the sacred authority of shrines and temples.

Kanatsubute is a shapeshifting menace of Narasaka recorded in the Treasure Tales (Hōbutsushū). It hurled small gold pebbles like shot to ambush travelers, behaving more like a bandit than a phantom. In the Otogi-zōshi tale of Tamura, it appears as a gigantic monk, wielding three gold stones—Tarō, Jirō, and Saburō—to smash people, horses, and pack trains. The warrior Inase Gorō Sakanoue Toshimune eventually subdued it; Kanatsubute surrendered and was executed. Its hallmark is the uncanny skill with golden gravel and its reign of terror on the Narasaka pass.

“Momongaa” is a specter name found in Edo-period picture books and printed collections. It is said to appear at night from an upstairs room or by a window to startle people. Illustrations show it with bulging eyes and a split, gaping mouth, or as a white lump of flesh with stubby limbs. No fixed origin or rites are recorded. The name echoes a startling cry, and its forms vary across herbals, essays, and picture scrolls.

A shape-shifting tanuki specter from Keida in Mishō Village, Miyoshi District, Tokushima. It appears when boats anchor late at night at the Aoiseki (Blue-Stone Rapid) on the Yoshino River, extending an enormous kiseru pipe and demanding tobacco. If you can pack the pipe full, it causes no harm—but the amount required is absurdly large. If your supply runs out, it capsizes the boat or triggers strange disturbances. It is a waterside tanuki that frightens travelers and boatmen, told as a cautionary tale.

Ao-andon is a yokai of the printed page, formed where the blue-paper lantern used in Hyakumonogatari gatherings meets the strange figure Toriyama Sekien drew in his early modern collection of yokai images. Its earliest documented named appearance is in the middle volume, "Mist," of Hyakki Yagyō Shūi, prefaced in 1781. The title slip calls the work Konjaku Hyakki Shūi, while its preface title gives Hyakki Shūi; the same work has come down under more than one title. Ao-andon occupies the right-hand page of a double-page spread and is an independent entry, with its own heading and explanatory note, separate from the Ameonna on the left. The device of telling ghost stories beside a lantern covered in blue paper appears in literature before Sekien. Asai Ryōi’s Otogibōko, book 13, "To Tell of the Strange Is to Invite the Strange," was first published in 1666. In the text of an edition published in 1699, a single lantern is covered in blue paper and fitted with one hundred wicks; one wick is removed after each tale. Yet that gathering is interrupted by a strange occurrence before it reaches a hundred stories, and it features neither a horned figure nor the yokai name Ao-andon. It is prehistory for the apparatus of Hyakumonogatari, not the first appearance of Ao-andon itself. Sekien’s note relates that when a lamp seems about to go out, then brightens again, and its shadows tremble and darken, something called Ao-andon may appear. It goes on to explain that people who hold Hyakumonogatari gatherings have long covered their lanterns in blue paper, and cautions that telling of demons in the night invites the strange. It says nothing of a hundredth tale, a final wick, total darkness, or an appearance that is inevitable. Accounts of Hyakumonogatari include strange events around the ninety-ninth tale, events after all one hundred tales have been told, and even stories that turn to laughter when a supposed monster proves to be a dog’s or a person’s leg. Nor is there evidence of a universal rule requiring participants to stop at ninety-nine. The figure in the illustration has long hair, two hornlike projections on its head, and darkly rendered teeth. Inside the lantern, whose front frame has been removed, are an oil dish and wicks; on the floor lie a box, papers, and slender objects that may suggest combs or hairpins. Sekien’s note does not identify them as love letters or sewing tools, however, and it tells no story of a jealous wife, a husband’s betrayal, or a vengeful grudge. Its personality, purpose, victims, attacks, speech, weaknesses, and means of exorcism are unknown. Later yokai dictionaries and creative works have portrayed Ao-andon as a demon woman who stands at the culmination of Hyakumonogatari, gathers fear, or judges ghost stories. Those images are a rich reception history generated by Sekien’s spare single page, but they must be read apart from the Edo-period note itself. The repeated incorporation of early modern yokai imagery into modern creative work is one reason Ao-andon has acquired further layers in each era. The historical record does not identify a specific place of origin, sighting, shrine, or rite, and Edo is not treated as the location of a regional tradition.

A female yokai depicted by the Edo-period artist Toriyama Sekien in Konjaku Hyakki Shūi. She peers over a wall with her mouth agape, cackling kera-kera to bewilder passersby. Sekien alludes to a Chinese anecdote by Song Yu, likening her to the spirit of a woman whose coquettish laughter unsettled hearts. No specific locale or backstory is given; later tradition remembers her as a eerie, laughing apparition.

A spectral creature depicted in Edo-period yokai picture scrolls. It wears garments, spreads its forelegs wide, and has a horse’s face with bulging, upward-thrust eyes and cloven deer-like hooves. Identical images appear in late-18th-century works such as the Hyakumonogatari Kae Emaki, Oda Gyochō’s Night Parade of One Hundred Demons, and Bakemono-zukushi emaki. No period captions explain its behavior or origin. The imagery likely plays on the word baka (“fool”), but its function—harmful or helpful—remains unknown in the sources.