Traditional Yokai Encyclopedia

Typified by records tracing to Lake Biwa, it is a collective form of strange lights that cling in faint specks to rain cloaks, umbrellas, and garments on rainy nights. They carry no heat and increase in brightness and number when brushed at, yet disperse naturally when garments are removed, a flame is lit, or time passes. Names and interpretations vary by region, with some seeing them as spirits of drowning victims, others as animal tricks or natural bioluminescence. Rather than causing harm, they are said to bewilder and unsettle, and are often visible only to solitary individuals.

In the lineage attributed to Toriyama Sekien’s Konjaku Hyakki Shūi, the shink—an enormous clam—exhales a vapor at the shore, which fills the sky and forms images of towers and palace gates. The imagery depicts inverted or elongated castles and gatehouses drifting above the sea, sometimes shown alongside the shink itself or a dragon. In the late Edo period the motif was repeated in surimono and ukiyo-e and became a popular topic among spectators. The tradition is not fixed to a single locale, with sightings told from coasts and tidal flats such as Etchū. As a yokai it lacks a stable body, appearing and vanishing to beguile onlookers while causing little harm.

Based on the tsukumogami image of the meshibitsu told across Okinawa. A rice bin long used or cast aside gains a spirit and becomes active at night. It may appear alone or with kindred utensils like pot bins, forming circles to dance and make lively sounds in empty squares or dumping grounds. To human eyes they can look like young men and women, inviting passersby to join their revel if approached, then returning to their utensil forms at dawn. Some tales tell of beguiling illusions such as appearing as a cow or other odd shapes, but they are not killers, serving more as a warning against mistreating old tools. Households were advised not to discard aged rice bins or pot bins carelessly, but to dispose of them quietly or offer words of thanks.

Misogoro boasts a body so massive that he can sit on Mount Unzen and wash his face in the Ariake Sea, and his every movement is said to have carved the geography of the Shimabara Peninsula. His braced footprint on Mount Takaiwa became Suwa Pond, and the dirt he tossed aside while farming became Yushima (Dangoshima) Island. This chain of origin tales elevates him from a mere apparition to a creator-giant who birthed the peninsula's landscape. The extraordinary diet of licking four *to* of miso a day is a rustic narrative device measuring the giant's body against local staple goods, inseparably linked to the miso-brewing lifestyle of the peninsula. While belonging to the *Daidarabotchi* giant lineage, the unique aspect of the Shimabara version is that he is described with a mildness that helps people without malice. Today, he lives on as a symbol of local heritage in Minamishimabara City through statues and festivals.

Based on the depiction of Mizude in Takehara Shunsen’s Ehon Hyaku Monogatari. As censure for the abandonment of a corpse, bare bones rise of their own accord to sing and dance, symbolizing that mistreating the dead invites the uncanny. Closer to a tale of vengeful spirits than to a mere monstrosity, it manifests signs from the unoffered dead. Though the dancing and singing appear comical, the didactic thrust is strong, urging proper funerary rites. Specific places and names—Yuigahama, Hachirō of Tone, Hōjō Tokiyuki—anchor the story in the memory of war chronicles. The plot in which temple monks bury the bones to quell the anomaly exemplifies the temple’s social role of pacifying spirits through memorial rites.

An interpretation of a tsukumogami rooted in Toriyama Sekien’s imagery, layering the sleepless symbolism of the wooden mokugyo with Daruma’s rigor of training. More often understood as a moral metaphor within temple culture than as a tale told to frighten. Some regions claim a mokugyo sounds on its own in the hall at night, but systematic oral tradition is scarce. Later artists such as Yoshitoshi followed the design, fixing the visage of a face upon a mokugyo seated on a round mat. It is positioned less as a source of terror than as a presence that sharpens the tension of practice.

Reconstructed from Toriyama Sekien’s imagery and captions as a swarm of disembodied eyes gathering on the shoji of a ruined dwelling. Rather than inflicting direct harm, it unsettles by staring. It is mediated by domestic neglect and unappeased sentiments, yet belongs to a generalized lineage of house-haunts not tied to specific individuals or locales. This reading also aligns with later variations in collected names and with links to visual illusion phenomena.

A demoness archetype fixed in Noh, joruri, and kabuki from the Muromachi to Edo periods. She appears under the pretext of autumn leaf viewing as a courtly lady-in-waiting or princess’s attendant, lulling suspicion with music and dance. At the feast she inebriates warriors, but near midnight her nature is exposed by divine protection or a sacred blade, and she reveals her true form in the wilds of Mount Togakushi. Commonly called Momiji, she bears aliases such as Princess Sarashina depending on the work. Her slaying tales extol martial virtue and reflect awe of the mountains, inheriting Togakushi worship and the rhetoric of oni-hunting lore. On stage, the contrast between the elegant disguise of the first act and the ferocious demon visage of the second is emblematic.

An image based on what appears in Edo-period prints. It thrusts out huge round eyes and a split mouth from an upstairs doorway or by a paper screen, baring sharp teeth to bluff and frighten, or writhes on all fours as a white lump of flesh with stubby limbs. Its name has the ring of a shouted call, and it is depicted as a specter that turns away nighttime visitors. It claims no personal name or lineage, emphasizing a showy display of monstrous features.

Based on Toriyama Sekien’s image and notes, this version frames the entity as an old man–shaped specter appearing on open fields at midnight. Its name is taken as a blended form of child language like “momon-ga” and “gagoji,” embodying generalized fear of monsters. The belief that witnesses fall ill aligns with older notions that contact with the uncanny brings impurity and sickness, with no concrete acts of harm described. Early modern taboos against eating game and the euphemism “momonjii” may have encouraged its visualization through name association. Later readings place it as dwelling in mountains yet appearing at street corners to startle people, or as the city-going form of the nobusuma, but primary tradition is scant and no broad folktale type is attested. Accordingly, this version treats specifics as unclear, emphasizing its scenic traits—encounters on nighttime fields, fog, and wind—and its feared power to bring illness.

An image of the Moon Rabbit grounded in Japanese iconography. From Asuka-period examples onward, the rabbit within the lunar disk was paired with the solar crow in medieval Buddhist painting and received as a bearer of celestial phenomena. In early modern times, depictions of a rabbit using a Chinese-style mortar and pestle spread through books and prints, and by the eighteenth century the mortar shifted into a characteristically Japanese hourglass shape. The rabbit came to be understood not as compounding an elixir of immortality but as pounding mochi, linking it through wordplay to moon viewing and full-moon festivals. In lore, a self‑sacrificing rabbit ascends to the moon by Indra’s grace, with the lunar shadows and smoke-like markings read as its traces. In folk practice, people gazed at the moon seeking the rabbit’s silhouette, and the theme persisted in moon‑vigil gatherings and storytelling, overlapping with other celestial yokai and lunar deities.

A classic example of illusion craft attributed to the tanuki of Awa. It presents indoor furnishings incongruously outdoors and compels the target to keep “lifting” or “peeking,” eroding their sense of direction and time. The number thirty-six is sometimes linked to shugendō numerology, but local tales give no strict rationale, instead advising a practical countermeasure: stay calm and brace the belly. It causes no harm, and at dawn the spell breaks and the path appears as if nothing happened.

This version draws on Chinese materials cited in the Edo-period encyclopedic Wakan Sansai Zue and on Toriyama Sekien’s pictorial interpretation. The mountain spirit lurks in the hills, watching mountain huts where salt is set out for cooking or work and edging closer to them. Sources differ on size, some saying about one shaku while others claim three to four shaku. Its hallmark is a single leg with a heel set backward, making its tracks hard to read. It favors small wetland creatures like crabs and frogs and appears along stream gullies. It is said to bring lustful harm at night, but will retreat if the drought deity’s name “Batsu” (Hatsu/Boatsu, the Chinese demoness Ba) is spoken, a type of name-utterance apotropaic. Those who harm or consort with it suffer illness or fires, functioning as a cautionary taboo against contact. In Japan, Sekien labeled it “Yamaki” (mountain demon) and depicted it peering into a hut with a crab in hand, providing visual cues; local oral lore is scant, and treatment remains largely bibliographic. Modern reinterpretation is restrained, keeping to the contours of old records.

A canonical image of Muginodo Daimyojin found in measles prints. A formidable deity subdues a red-black oni under both feet while onlookers press their hands in prayer. Though the god’s origins are unclear, the image renders the disease visible and calms anxiety through the act of trampling. The accompanying text lists convalescent care, dietary restrictions, and prayers for recovery, blending devotion with practical guidance. The design reflects the plain sincerity of folk belief.

A trickster figure based on mujina tales from across Japan. It appears as a beast about the size of a dog with slightly short forelegs; elders are said to show a cross-shaped patch of fur on the back. Skilled at disrupting attention and sense of direction, it makes travelers mistake fields for rivers, ridges for water surfaces, and straw stacks for human figures on night roads. Malicious ones disguise food and latrines as other things, causing shame or misfortune. When taking human form it favors inconspicuous looks such as a boy, a traveler, or a village woman, and may lure with voice alone. In many regions its lore blends with tanuki and fox tales, with the name “mujina” used regardless, but it broadly belongs to the class of beasts that bewitch. Rather than being repelled by martial arts or spells, most stories end with it vanishing once its true nature is seen through, after which it avoids the area. The proverb “mujina of the same hole” means birds of a feather, combining the observation that they share burrows with associations from trickster tales. Traditions are rich in eastern Japan, and Edo-period paintings depict it under the title “Mami” or “Badger.”

An edited version consolidating Edo-period pictorial sources of the “Inugake” apparition. Inugake are fur leggings worn from the waist to the legs for warmth and protection in hunting gear, placed within the lineage of tool-spirits that gain sentience after long use or separation from their owner. In Sekien’s illustration only the legs seem to walk independently, with the caption evoking the inugake of Kawazu Saburō in The Tale of the Soga. This is a literary hint by the artist rather than evidence of a specific vengeful-ghost tale. In early modern Night Parade of One Hundred Demons and tsukumogami scrolls, yokai wearing inugake appear, emphasizing the uncanny form of the gear. Its nature is generally to show up at night and startle people, with no clear record of harm or benefit. Localized traditions are scant, and most examples belong to urban pictorial culture. It is understood as a classic example of the idea that aged implements come to house spirits.

Myobu is the deified form of the white foxes serving as the familiars of Inari Okami, enshrined as "Myobu Tome-no-Kami" at Byakkosha, a subordinate shrine of Fushimi Inari Taisha. Unlike secular beliefs that worship foxes themselves as gods, the essence of Myobu lies in its reference to white foxes acting as divine messengers attending closely to the deity. "Myobu" is a title derived from the ranks of court ladies under the Ritsuryo system. Because they serve Inari Okami, who holds the Senior First Rank, the white foxes were likened to high-ranking court ladies of the imperial palace. The shrine building of Byakkosha, built during the Kan'ei era in the one-bay Kasuga-zukuri style with a cypress bark roof, is an Important Cultural Property. Initially called "Oku-no-Myobu" or "Myobusha," it is said in Harumitsu Harada's "Inari Jinja Engi" to enshrine Akomachi and Osusukiroku, originating from a court lady named Susumu Myobu. The statues of white foxes holding rice ears, scrolls, keys, and jewels in their mouths are an iconographic expression showing that Myobu is a pure divine messenger mediating the harvest of fields, words, storehouses, and treasures.

A compiled version of the Myōtaraten images rooted in local faiths of Echigo Yahiko and Okitama in Dewa. Their origin tales involve transformations of an old woman, an ogre, or a shapeshifting cat, whose ferocity is quelled when enshrined, after which they call rain and protect children and the virtuous as village guardian deities. Though bearing a Buddhist-style celestial name, the being is essentially a deified female presence embodying the numinous power of mountains and borders, centered on faith around Mount Yahiko and the Ichihon-yanagi wayside shrine. One tradition says thunder roars once a year when she returns to Sado, aligning agrarian views that link thunderstorms with harvests. Names and forms vary—old crone, celestial maiden, demoness—but the core is a turn toward benevolent protection.

A generalized classical image of the mōryō based on historical sources. The term was used for uncanny phenomena tied to watersides, graveyards, ancient trees, and great stones, and is understood to be linked with disasters that defile corpses and the spread of death impurity. Its form is not fixed—some accounts call it childlike, others say it manifests only as a vapor or miasma. In Japan, the word came to denote corpse-stealing spirits and served to justify funerary taboos and rites of purification.

This version relies solely on images from picture scrolls with minimal notes. Nade-zato has a transmitted name and appearance, but the textual account is missing, so its nature and conduct cannot be fixed. The iconography shows a shaven-headed, blind masseur-like figure with eyes left undrawn; some depictions emphasize long fingers or claw-like hands. Related imagery includes an identical type titled “Mugan” (No-Eyes) in Edo-period Hyakki-zu, suggesting variant naming. Tada Katsumi notes that nade may connect to nademono, which transfers defilement by touch, and to an old byname for “cat,” hinting at a being that feigns meekness to hide its true nature; however, this is scholarly interpretation, not a firm local tradition. Accordingly, abilities, weaknesses, and habits are scarcely recorded and should be treated as unknown.

The true essence of the Namahage lies in "blessings through awe." The act of clashing knives and storming into a house with loud voices is meant to engrave a powerful admonition upon children and the lazy; the violence itself is not the goal. Through a dialogue with the head of the household, the Namahage extracts a promise of diligence for the coming year, exorcises misfortune, and departs. This series of rituals has functioned as a mechanism to spiritually brace the entire village at the turning of the year. The design and color of the masks, the movements, and the spoken lines differ from village to village. Some areas receive visits in pairs, while others have strict rules for the visiting order and the etiquette of the dialogue. The straw that falls from their kede garments is picked up as a lucky charm for good health, demonstrating how the folk tradition links the deity's visit to practical, worldly benefits in various locales. The core of the Namahage event is not merely fearing them as demons, but treating them as "guest deities" (marōdogami) complete with rituals of welcome and farewell.

This Nami-kozō belongs to the coasts and estuaries of old Tōtōmi Province. Its origins follow two main lines. One makes it a straw doll released into a river by Gyōki; the other tells of a small being that sent signals in the waves to farmers suffering through a drought. It may look like a little child or a tiny doll, but its features are never fixed. Its essential task is to report changes in the weather. The direction and force of the sea's booming sound announce approaching rain or wind, allowing fishers to decide whether to launch and farmers to arrange their work in advance. The story turns a distant, difficult-to-explain roar into practical local knowledge. Ideas about flowing water and dolls overlap here with kappa tales and accounts that use the name Umibōzu. Whatever the name, the tradition remains a way of interpreting the roar of the sea and reading the weather. Nami-kozō is less a deity formally worshiped than a personification of a natural sign worthy of respect. Offerings and rites vary by community, and the surviving evidence depends on local records and oral tradition, leaving many details uncertain.

The form of a cat kept in a human home for many years, aging until its tail splits into two, thereby "ascending" to acquire the power to speak and manipulate ghostly flames. Discarding the "mountain beast" aspect spoken of for the species as a whole, this is an interpreted version that maximizes its nature as a "house yokai" (kayou) sharing living space with humans. In this version, the Nekomata is said to stand on its hind legs late at night, place a towel on its head, and dance wildly in the shadows of the hearth. This bizarre dance, originating from the depiction in Toriyama Sekien's "Gazu Hyakki Yagyo", added a somewhat comical and human-like charm to what was originally a terrifying monster cat legend. Furthermore, this Nekomata skillfully mimics the faces and voices of people to deceive family members. It often takes the form of an old woman, which is sometimes interpreted as a projection of the power and underlying intimidation of the matriarch who managed the household for years, superimposed onto the image of an old cat. The folklore presents a clear duality: if the homeowner treats the cat roughly or kills it unreasonably, it becomes a vindictive curse deity, setting ghostly fires (Nekomata fire) in the house and ruining the family lineage. On the other hand, a carefully cherished Nekomata uses its demonic powers to "protect the house." As depicted in works like Sawaki Suushi's "Hyakkai Zukan", there are benevolent tales of them shapeshifting into a shamisen-playing geisha to save a benefactor in a crisis, or using their demonic fire to intimidate and burn away other evil spirits or diseases (impurity) attempting to enter the home. To them, the split tail is not merely a sign of monstrosity; one tail serves as an antenna symbolizing "gratitude (or resentment) toward humans," and the other symbolizes "the demonic nature of a beast."

The Hearth-Guarding Old Nekomata is a version of a cat that has been kept in one place for many years, growing old by the hearth stained with soot and ash, until one night it suddenly manifests with a tail split in two. Positioned at the opposite extreme from the violent Nekomata that attacks humans in the mountains (as noted in texts like "Meigetsuki"), this being inhales the breath of the house and its generations of life, absorbing the spirit of fire and cooking smoke, and thus behaves much like a household deity (or Zashiki-warashi). While it is an extension of the folk belief that "a pet cat transforms" cited in "Tsurezuregusa", it carries a much more protective nature. Even without using human words, it signals by clinking the pot lid or drawing patterns in the ash. The pale ghostly fire (Nekomata fire) that darts in the corner of the parlor late at night is not a curse fire to be feared as in "Yamato Kaiiki", but is rather considered a purifying mark where this old Nekomata preemptively licks away the house's fire hazards and burns off evil energies. In some villages, it is believed that one tail connects "the lineage of the family" and the other "the divine spirit of fire," making the split not a mere deformity but a sacred sign holding dual duties. The Old Nekomata always draws near when the family gathers around a corpse. There is a common fear that cats resurrect the dead, often causing confusion with the Kasha (the monster cat depicted snatching corpses in works like "Gazu Hyakki Yagyo"). However, this version never causes a disturbance; it merely sniffs the ragged breath with its nose and lights a small spark to dispel lingering earthly attachments. Therefore, the proper etiquette is for the family not to brandish blades before the Nekomata, but instead to burn a single stick of incense as a "farewell fire." If a long-kept cat is treated roughly, the stove will burn empty in the dead of night, and overlapping wet footprints will appear on the walls. Conversely, in homes that mourn respectfully, folklore akin to the "urban legends" pointed out by Kunio Yanagita survives: on a snowy morning, only the space under the shoji is warm, and the shadows of mice vanish entirely from the rice bin. This version is sometimes spoken of as an old cat that once disappeared into the mountains returning out of longing for the house, or as an old indoor cat whose tail split naturally over time. The custom of cutting tails to prevent transformation (the origin of the bent-tail cat) also exists, but in areas protected by the hearth-guard, this is taboo, with strict warnings that "injuring the tail will also split the family's fortunes." In appearance, its back skin droops to look like a cloak, casting a shadow-like figure in dimly lit rooms. This is why it is mistakenly thought to shapeshift into the dead, but the Old Nekomata dislikes unnecessary transformation. When it occasionally borrows the appearance of a grandmother, it is only to lull a child to sleep, making no sound and leaving behind only the scent of soot and ash. Though it does not show itself to travelers, during milestones of the house—such as taking in a groom or the first night in a newly built home—it taps its claws lightly under the floorboards to foretell fortunes. Three taps mean good luck; two mean beware of fire. If the lamp wick is damp, it smoothes it with its tongue; if the stove fire is too strong, it fans it weaker with its tail. In exchange for taking on these small daily troubles, a custom remains for the family to share the "edges of the meal" with it. Three grains of rice, a pinch of salt, and a little steam. As long as these are observed, the Nekomata will not bewilder humans, and the strange noises at night will be dismissed as mere "house creaks."