Yokai Encyclopedia

A reconstruction based on the designs in Toriyama Sekien’s Hyakki Tsurezure Bukuro. The monk’s robes are a dull brown, layered thickly, with the collar hanging before the face to cast a beaklike shadow. Beads are held in one hand, a censer is set before it. Movements are unhurried; with each step the rustle of cloth sounds and a faint scent of incense drifts. Hints linking it to tengu remain only in the captions of the image, with no direct wings or long nose. It maintains autonomy as a tsukumogami, its tears and seams perceived as bearing will. It appears not where reverence for sacred implements is lacking, but shows signs near neglected robes and ritual tools, prompting awe rather than harm.

Akazashita is a rare case where imagery precedes textual records. Its core features are a colossal tongue thrusting from black clouds and a bestial face. Toriyama Sekien placed this figure over a sluice gate, and later scholars offered symbolic readings drawing on notions of filth such as scum and grime and on proverbs that cast the mouth and tongue as gates of calamity, but Sekien left no notes. In many early modern sources the sluice gate is absent, and the name wavers between Akazashita and Akakuchi. Links to the Onmyodo guardian name Akazashita-shin of the Grand Duke direction or to the Rokuyo day Akakuchi have been noted but cannot be firmly genealogized. Since the Showa era, fable-like explanations and local tales have spread, yet statements beyond the base sources should be avoided.

A red-haired apparition said to appear in the fields and hills of Katsugase in Tosa Province. It walks upright like a human, yet hides among tall bamboo grass and reeds, making its full form elusive. Its most striking trait is hair that shines like the sun; approaching and staring directly at it is said to dazzle the eyes and cause temporary visual impairment. Tales rarely attribute malice to it, focusing instead on discomfort caused by its visual impact. It is named in the late Edo to early Meiji Tosa Bakemono Picture Book, listed alongside local figures such as the Laughing Woman of Yamakita and the White Crone of Motoyama. The “Aka-gashira” in Hyakki Yagyo picture scrolls is sometimes cited as iconography, though identification remains cautious. Sightings are told of at dusk through dawn in the open country and survive mainly in local oral tradition.

Rather than a physical substance, the reviving incense is told in narrative tradition as a medium for reunion with the dead. The Chinese motif of seeing a figure within smoke was adopted into early modern Japanese literature and theater, where the handling of censers, incense wood, and ash is rendered with ritual care. In yokai picture compendia it sometimes appears as a type of tool-born apparition, with set-piece depictions of a visage forming in the incense smoke. It is often interpreted not as recalling a spirit itself, but only as manifesting a semblance or shadow. Medicinal virtues are mentioned as apocrypha in materia medica, yet Edo-period notes record skepticism and file it among curious tales. In Kamigata and Edo rakugo, a tryst lasts only until the incense or stick burns out, making the quantity and duration of incense a key stage device.

A post–early modern belief that a pillar installed upside down, defying carpenters’ respect for a tree’s natural root spread, brings mishaps to a house. Persistent midnight house-settling, creaking beams, and uncanny whispers were read as the “curse of the inverted pillar,” prompting reinstallation or prayer. Shigeru Mizuki notes leaves birthing a spirit from the reversed wood, or the pillar itself transforming, yet older records more often treat it as signs of noise, misfortune, and ill omen. Deliberate inverted motifs used as apotropaic design (e.g., Yomeimon) belong to the ritual idea of intentional imperfection and are distinct from this yokai. As a taboo rooted in building folklore, it appears in regional carpenters’ lore, temple and shrine records, and essays.

Based on the belief that tools become spirited after a hundred years, this yokai is depicted with an old iron cauldron for a head. It lingers in the night, issuing faint tremors and steam that produce low sounds. The ringing is read as an omen of fortune or misfortune, falling silent if met with careless clamor, and responding when approached with reverence. It embodies divinatory function and the memorial veneration of well-used objects.

This is Rokuemon, the supreme commander of the Awa tanuki residing in Tsuda-ura. Ruling as the grand general over all tanuki in Shikoku, he stands as the veteran leader at the pinnacle of the tanuki hierarchy, where they fiercely compete for the title of "Senior First Rank." He once took in Kincho as his disciple and attempted to have him inherit his legacy through a marriage to his daughter. However, after Kincho fled, Rokuemon eventually faced him as a mortal enemy on the banks of the Katsuura River. Following a massive three-day and three-night battle involving over six hundred tanuki, it is said he fell in a final one-on-one duel. Yet his name has been passed down through storytelling, films, and animation, and he remains vividly remembered today as the indispensable co-protagonist of the Awa Tanuki War.

Rokurokubi is a humanlike apparition that may have a neck stretching far while still joined to the body or a head that separates completely and flies. Its name appears in seventeenth-century haikai and ghost stories, but its form and character vary greatly by period and source: stories that feel like dreams to the sleeper, accounts explained through karma or curses, images linking head and body with a fine line, and the detached-head form depicted by Lafcadio Hearn. It is comparable to Chinese Luotou people and flying-head traditions, but cannot be explained through one direct origin alone.

Ryujashin occupies a unique position as a "divine messenger" functioning within the specific ritual context of Izumo's Kamiari Festival. While general dragon gods (composite water deities governing water, rain, and the sea) are based on nationwide rain-making and rain-stopping beliefs, Ryujashin is strictly a functional deity acting as the guide for the eight million gods, limited to the Kamiari rituals of shrines like Izumo Taisha and Sada Shrine. Its essence is not an abstract concept of faith, but a real marine animal—the yellow-bellied sea snake—that actually washes ashore on the Izumo coast in late autumn. The perfect alignment of a natural phenomenon (warm-water sea snakes drifting on the Tsushima Current) with mythological time (the gathering of gods in the Kamiari month) forms the core of a rare seasonal ritual. The washed-ashore individuals are dedicated to the Grand Shrine, and through the Ryuja-ko of Izumo Taishakyo, it developed into an independent object of worship, with talismans distributed to the common people for protection against fire, water disasters, theft, and for good fortune. By visiting from the Eternal Land and the otherworld beyond the sea, it embodies the ancient worldview that saw Izumo as a passageway to the otherworld.

An extraordinary figure from Hida Province described in the Nihon Shoki as having one body, two faces, and four hands that used bow and arrows. After being put to death by Naniwa no Neko Takefurukuma for defying the imperial command and plundering the people, Sukuna was remembered in Hida and Mino traditions as Senkōji’s founder, Zenkyūji’s manifestation of Kannon, and Nichiryūbu-ji’s dragon-defeating figure. Enkū’s devotional image sets the two faces side by side.

As the water god who stills storms, Ryūjin stands at the meeting of sea and sky and holds the weather in divine power. Fishers, sailors, and rice-growing communities all prayed to this god in moments of need. That power has two edges: timely rain can nourish a field, while great waves and violent wind can break a ship. People therefore developed rites not simply to obtain power from Ryūjin, but to soothe the raging aspect of water and invite its life-giving one. The sea god's greatest treasures are the tide-flowing and tide-ebbing jewels, which command the rise and retreat of the sea. Yamasachi-hiko receives the pair from the sea god, uses one to overwhelm his elder brother with water, and the other to draw it away and save him. Their control of the tide expresses the heart of Ryūjin's authority. Coastal shrines received prayers for calm weather and a rich catch; inland rites sought rain, offered black horses in drought, or lowered offerings into deep pools. Legends from Lake Ashi and other waters in which a monk subdues a dragon and transforms it into a guardian preserve the close bond between fear and reverence. Ryūjin's role as lord of the Dragon Palace grows from the same divinity of water. Beyond the sea or beneath it lies a realm of wealth and a different measure of time. A visitor may return with treasure, or carry away years that cannot be recovered, as Urashima Tarō does when he opens the jeweled box. Ryūjin is therefore not merely a fabulous beast but the deification of water itself, the source on which life and death both depend. To still the storm is also to renew the fragile covenant between human beings and the natural world.

The daughter of a dragon king, or a dragon in a woman's form. This version follows her from the eight-year-old daughter of the dragon king Sāgara who offered a jewel and became a buddha in the Lotus Sutra, to Toyotama-hime, the sea god's daughter who became a dragon in childbirth, Zennyo Ryūō, who came to Shinsen'en in answer to Kūkai's prayer for rain, Seiryū Gongen of Daigoji, and the spirit of the Shido diver who dances as a dragon girl in the noh play Ama.

An image based on Toriyama Sekien’s Hyakki Tsurezurebukuro. The saddle itself forms the torso, accompanied by a caption indicating damage around the front bow. Eyes peer from the base of the stirrup leathers, and the mouth splits at the front bridge to reveal fangs. The hands are rendered as extended girth straps, grasping a whip at the tip. As a tsukumogami, it follows the early modern idea that old implements gain spirit through long use or resentment. The saddle, a nexus between lord and retainer and a vessel of battlefield memory, serves as a moral emblem warning against wrongful deaths and negligence. Paired with the stirrup mouth, it thematizes preparedness and care for one’s tack, with its monstrosity reflecting carelessness and impropriety like a mirror.

This version of Sakanoue no Tamuramaro is not treated as the historical military official, but as the deified Tamura Daimyojin of later generations. He is told as a warrior receiving the protection of Kannon at Kiyomizu-dera, a paired husband-and-wife deity with Suzuka Gozen at Suzuka Pass, and as General Tamura subjugating Akuro-o and Otakemaru in Tohoku. A single person's name wandered through the temple origins of Kyoto, the mountain pass faith of Suzuka, and the shrine and temple origins of Tohoku, acquiring different faces in each land. The power of Tamuramaro is not the sword that slashes demons itself. Kiyomizu Kannon, Vaisravana, Suzuka Gozen, the sacred sword, and the gods of the passes support his story, transforming his martial prowess into "protection acknowledged by the gods and buddhas." Therefore, in the Tamura-gatari, rather than the scenes of defeating enemies, what matters more is which gods and buddhas took his side, in what land he was enshrined, and to which mounds or temples the memories were transferred. Sakanoue no Tamuramaro is a hero who defeats yokai, but at the same time, an axis to pass down yokai as stories to later generations.

In this version, we read Sakata no Kintoki as "the warrior who brings the power of Mt. Ashigara back to the capital." Kintoki does not appear as a polished samurai from the start. As Kintaro, he is a boy of superhuman strength raised by a yamanba, intimate with bears and beasts, carrying a broadaxe. This childhood image retains the strangeness of a child raised outside human society. The scene where he is discovered by Yorimitsu is the moment the direction of Kintoki's power changes. The superhuman strength naturally exerted in the mountains is converted into the abilities of a warrior serving a lord. This is also a story of civilizing wild power. Kintoki does not discard the otherworldly realm of the mountains, but enters the Four Heavenly Kings carrying that power. Because of this, he possesses an exceptional body within the samurai band of the capital. In the subjugation of Shuten-doji, Kintoki is a figure who confronts the demons of the mountains using the power of the mountains. The demons of Mt. Oe are anomalies secluded outside the capital, and Kintoki likewise possesses power from the otherworldly realm of Mt. Ashigara. The two can be seen as entities that have distributed the same mountain power to different sides. If the demon is the otherworldly power threatening human society, Kintoki is the warrior who has reclaimed that power for the human side. The brightness of Kintaro's image was greatly emphasized in its reception in later eras. In May dolls and children's songs, Kintaro becomes a symbol of health, robustness, and growth. However, if we only look at that healthy boyish image, yokai-like elements such as the yamanba, beasts, and superhuman strength fade away. In this version, we read him while retaining the outline of the prodigy raised in the mountains behind the cheerful folk character. Sakata no Kintoki is not a yokai, but he represents "supernatural ability on the human side" in yokai tales. He does not confront the demons from completely within human society; he confronts them with a power nurtured in a place close to mountain anomalies. Therefore, even among Yorimitsu's Four Heavenly Kings, he is a presence standing on the boundary between the capital and the mountains, child and warrior, hero and abnormality. Kintoki's superhuman strength is not just about being strong; it raises the question of where that power came from. Is he strong because he was raised with beasts on Mt. Ashigara, or did he gain otherworldly power through the yamanba's blood or upbringing? The legends do not answer clearly. That ambiguity places Kintoki on the border between humans and yokai. Being summoned by Yorimitsu is a socialization for Kintoki. He, who was a free boy of superhuman strength in the mountains, gains a lord, a name, and becomes a member of the Four Heavenly Kings. The power of the otherworldly realm changes into the power of a samurai family by being given a name and a role. Herein lies the great transformation from Kintaro to Sakata no Kintoki. In this version, we also do not take the brightness of the Boys' Festival lightly. When households wishing for their children's growth display Kintaro dolls, the superhuman strength of the mountains turns into a blessing. Yokai-like power, rather than being feared, becomes a symbol of protecting and raising children. Kintoki is also a rare example where otherworldly power was gently converted into domestic wishes. The story of Kintoki is not one of eliminating otherworldly power, but of re-nurturing it. The power nurtured under the yamanba does not disappear even when he comes to the capital. Rather, by gaining a role under Yorimitsu, it turns into the power necessary for demon subjugation. This is where the fascination of bringing yokai-like elements to one's own side lies. This gentle transformation is what makes Kintoki an intimately familiar hero even today.

Known as the King of the River, Daisuke of the Salmon marks forbidden periods and seasonal rites during the salmon run. On set dates—such as the fifteenth of the Frost Month and the twentieth of the Twelfth Month—Daisuke and his consort Kosuke are said to proclaim in loud voices. Anyone who directly hears them dies three days later, so riverside communities kept those days as no-fishing days, ringing gongs, singing, and pounding rice cakes to block out the sound. In tales along the Shinano River, a powerful elder who forces taboo-breaking meets a water authority in the guise of an old woman and dies suddenly with the run’s onset, embodying awe of nature and adherence to proper conduct. The old woman is read as a personified river spirit or Daisuke’s avatar, though never revealed outright. The name varies between “Daisuke of the Salmon” and “Daisuke the Salmon,” and his wife is called Kosuke. Recorded from the early modern period in surveys and folktale collections, this motif spreads across the salmon culture zone of eastern Japan beyond specific locales. Creative variants are few, and the core points—voice, dates, taboo, and fatal retribution—remain consistent.

This is an interpretation of the "apex predator of the sand sea that attacks upon detecting vibrations," burned into the minds of modern people through games and fantasy works. The Sandworm in this version lacks sight; instead, it acutely senses the slightest "footsteps (vibrations)" of humans walking on the surface, embodying the ultimate panic horror as it suddenly opens its massive jaws from underfoot to swallow its prey whole. Speaking of Japan's indigenous subterranean anomalies, there are the "Giant Catfish (Oonamazu)" and "Giant Earthworm" that cause earthquakes, but while they are symbols of "the disaster itself," the Sandworm is strictly set as a "creature reigning at the apex of a harsh ecosystem," reflecting the rationalism of an imported monster. Layers of sharp concentric fangs, an armor-like hard body surface, and overwhelming mass that even swords and magic (or modern weaponry) cannot penetrate. It is the crystallization of the unfathomable terror and romance that the Japanese, living in an island nation surrounded by the sea, harbor toward the "endless desert" they have never once stepped foot in. Precisely because it lacks the background of a local indigenous spirit, it continues to evolve and grow larger in new creative works today as a purely "desperate foe in the struggle for survival."

The core of Sanki Daigongen lies in its reversed divine nature, transforming the originally feared oni into a "guardian deity that wards off evil." The three demon gods—Tsuicho, Jibi, and Mara—each govern fortune, wisdom, and subjugation, with Dainichi Nyorai, Kokuzo Bosatsu, and Fudo Myoo as their original Buddhist forms. This trinity structure demonstrates the fusion of the Honji Suijaku (original reality and manifested traces) thought of Shingon esoteric Buddhism with mountain asceticism and tengu worship. The fact that it commands large and small tengu as familiars is directly connected to folk tales of Mount Misen being a spiritual mountain of tengu (like the tale of Masanori Fukushima's tengu extermination). It embodies the sacredness of Mount Misen itself, characterized by Kukai's founding, the unextinguishable spiritual fire, and the strange rock formations likened to Mount Sumeru. The Itsukushima Shrine (Ichikishima-hime and Benzaiten) on the sea and Sanki Daigongen on the mountain form a pair as the guardian deities of the two poles of Miyajima—the sea and the mountain.

A figure based on local lore in which death-spirits amassed at a burial ground (zammai) congeal and manifest as a single monster. In Toyama it appears as a humanlike specter that performs ominous signs, while in Ishikawa it is feared as a giant priest-like ogre. It is bound to human life, death, and the order of funerary practice, often marked by nighttime sounds and prescribed etiquette. Widely said to be unable to cross running water, a belief linked to folk practices of digging trenches around the zammai. Its form and stature are not fixed and vary with the density of gathered spirits. Folklore records note collections from the early Showa era, with regional spellings such as “Zammai” and “Zanmai.”

An image based on folk belief that crabs with human-like patterns on their carapaces washed up on Sanuki shores embody the vengeful spirits of the defeated Taira clan. Historical sources tie these crabs to various locales, with Sanuki famed due to memories of the Battle of Yashima. As a yokai, it is said not to harm people directly, but to make onlookers recall the karma of the battle and feel awe. It is distinctly linked with acts of memorial service and consolation for the dead, and differences from other regional names are considered nominal only.

Based on the Noto region’s distinctive image of the saru-oni. It has an ape-like body crowned with a single horn and dwells in rock caves, menacing livestock and people near settlements. It appears under cover of night and is feared as a boundary breaker between the mountains and the village. Communities sought the protection of local tutelary deities, and tales of subjugation by bow and arrow are tied to place-name origins. After its defeat, its horn is said to have been enshrined, and memorial shrines were established, pairing awe with appeasement. The saru-oni is told as a singular creature rather than a pack. Its range centers on cave mouths and the satoyama borderlands, its presence marked by a bestial stench and legends of black blood.

In medieval Japan, the monkey deity was told as a fusion of mountain divinity and simian monster. It ruled mountain domains and demanded offerings like a calendar ritual, seen as a relic of ancient sacred marriage rites, yet storytelling emphasized its brutality as a yokai. In slaying tales, a passing hunter or a monk with sacred power stands in as a substitute, and a trained dog plays the decisive role. The defeated deity sometimes possesses a shrine official to beg forgiveness, hinting at lingering sanctity. In some regions it was known as a possessing spirit, with sudden rages blamed on its curse. Early modern ghost stories pair man‑eating ferocity with comic butt‑fondling, portraying the ambivalent scorn and fear directed at monkeys.

Special Position in Ancient Mythology as the 'Grotesque Guiding God'. While the basic description touches on Sarutahiko-no-Mikoto's main myth, this detailed explanation delves into his unique position as a 'grotesque guiding god' in ancient Japanese mythology. His bizarre appearance, with a nose seven ata long and eyes shining like the Yata-no-Kagami, is extremely visual and concrete even among the descriptions of deities in ancient myths, serving as the ultimate religious expression of 'a deity standing at the boundary between the otherworld and this world.' The fact that such a strong contrast between the noble Amaterasu-lineage deities and a grotesque Kunitsukami was placed at the core moment of the Tenson Korin, the central ancient Japanese state myth, can be interpreted as an intentional narrative device by the myth's compilers. Grotesqueness is not just visual oddity; it is the concrete embodiment of universal religious feelings such as protection from the otherworld, crossing boundaries, and reconciling with the heterogeneous. Prototype of the Tengu ── Development into Shugendo and Mountain Beliefs. Sarutahiko-no-Mikoto's grotesque description (long nose, red face, glowing eyes) is folklorically positioned as the prototype of the later Tengu (shugendo-related mountain yokai). The Tengu beliefs of the Heian and medieval periods inherited Sarutahiko's grotesque nature while intricately intertwining with Buddhism, shugendo, and mountain worship to undergo unique development. The hierarchical system of Tengu, such as Daitengu, Karasu Tengu, and Konoha Tengu, can be understood as the medieval refinement of the 'grotesque deity' originating from the ancient Sarutahiko. The relationship between Sarutahiko and the Tengu is a crucial genealogical theory in Japanese yokai studies, serving as core material for examining the continuity between ancient mythology and medieval yokai culture. Reconciliation and Cooperation between 'Amatsukami and Kunitsukami'. In the political and religious event of the Tenson Korin, where 'Amatsukami (deities of the heavenly realm) descend into the territory of Kunitsukami (deities of the earthly realm),' Sarutahiko-no-Mikoto stands out as a rare Kunitsukami who proactively welcomed the Amatsukami. In contrast to Okuninushi's yielding of the land, which was a 'forced transfer,' Sarutahiko's guidance occupies the contrasting position of 'voluntary cooperation.' This represents two aspects of religious integration between the center (Amatsukami lineage) and the periphery (Kunitsukami lineage) in ancient Japan. The contrast between forced integration (Okuninushi) and voluntary cooperation (Sarutahiko) reflects the editorial intent of the ancient state myths and the complex multiplicity of ancient Japanese political history. The Tragedy of the Hirabu-gai ── Vulnerability of the Deity and the Meaning of His End. The ending where Sarutahiko-no-Mikoto drowns after being caught by a hirabu-gai is a unique tale in ancient mythology that expresses the vulnerability of deities, human contingency, and the unknowability of fate. The ironic conclusion in which the great guiding god receives a fatal wound from a small natural object like a shell mythologizes universal themes in ancient Japan, such as 'confrontation with nature,' 'the limits of heroes,' and 'the unknowability of fate.' Furthermore, the specific circumstance of 'an accidental death while fishing' includes a religious reflection of marine, fishing, and coastal life in ancient Japan, symbolically demonstrating Sarutahiko's essence as a god standing at the boundary of sea and land, the intersection of life and death. The ending of the myth is not merely a tragedy but an advanced symbolic device that narrates the essential attributes of the deity. The Core of Doso-jin and Crossroads Deity Beliefs ── The Heart of Nationwide Folklore. From the Middle Ages onwards, Sarutahiko-no-Mikoto was widely venerated as the guardian deity of village boundaries, crossroads, mountain passes, and barriers through syncretism with Doso-jin, Funado-no-Kami, and Sae-no-Kami. The fact that Sarutahiko is positioned at the center of folk religion, such as Doso-jin stone monuments, phallic stones, crossroads Jizo, and Sae-no-Kami festivals distributed nationwide, demonstrates the continuous inheritance from ancient state myths to medieval folk religion. Doso-jin worship is not merely a religious ritual but a folkloric practice that gives meaning to universal anthropological themes of 'boundaries, new beginnings, protection, and harmony' through ancient myths. As a deity supporting the roots of Japanese people's sense of life, movement, and boundaries from ancient times to the present, Sarutahiko possesses a cultural reach that transcends a single deity appearing in a myth. Association with Koshin Belief ── Popular Religion in the Edo Period. During the Edo period, due to the phonetic association of 'Saru' (monkey) in Sarutahiko, he was linked to the Koshin belief (originating from Chinese Daoism, involving an all-night gathering every 60 days to defeat the Three Corpses), and Koshin towers, Sarutahiko Koshin mounds, and the three wise monkeys (see no evil, hear no evil, speak no evil) spread nationwide. This is a representative example of the multilayered fusion of ancient mythology, medieval Doso-jin, early modern Daoism, and Edo popular religion, demonstrating the typical Japanese religious culture of 'syncretism through phonetic association.' The combination of Koshin and Sarutahiko beliefs functioned as a core institution supporting the collective religious life, village society, and nighttime socializing of commoners in the Edo period, leaving traces in the modern landscape of the three wise monkeys and Koshin mounds. Sarutahiko-no-Mikoto in the 21st Century ── Modern God of Travel, Guidance, and New Beginnings. Today in the 21st century, Sarutahiko-no-Mikoto is widely cherished as the god of 'roads, travel, new beginnings, and guidance,' serving as an object of prayer for new car purchases, traffic safety, starting new businesses, safe travels, and major life milestones. Pilgrimages to Tsubaki Grand Shrine, Sarutahiko Shrine, and Futamiokitama Shrine continue ancient customs, and the religious structure of the ancient myth of 'visiting Amaterasu-Omikami under the guidance of the guiding god' has been inherited to this day. Even in a modern society marked by globalization, informatization, and individualization, the universal theme of 'life's paths, choices, and guidance' continues to impart new modern meanings to the ancient guiding god. As a rare deity whose presence bridges ancient mythology and modern Japanese spiritual culture for over two thousand years, he bears a living inheritance in religion, culture, and tourism in the 21st century.

A dream ghost story posted on August 2, 2000, to the Sharekowa thread on 2channel’s occult board. On a monkey train at an unstaffed station, passengers are killed in order with each announcement—“ikezukuri,” “gouging,” “mincemeat”—and the narrator, dreaming the continuation four years later, hears a voice say, “Next time you come, it’ll be the end.” This version follows the original and the later accounts that turned the ride into a bullet train, a streetcar and a Kintetsu limited express.