Yokai Encyclopedia

A figure based on Edo-period essays and ghost tales. Ranked below the long-nosed yamabushi-style tengu, it performs menial tasks and is described as birdlike or as a human-faced bird. Accounts vary by region and source: flocks seen at night catching fish on the Ōi River in Suruga, references to them as white wolves within the tengu realm and as elder wolves elevated in rank, and tales of trickery such as a hunter in Iwakuni being toyed with by a tengu disguised as a boy. Overall, rather than causing great harm to people or livestock, they tend to interact through shapeshifting and bewilderment. Ukiyo-e sometimes shows them resting in trees, suggesting they are not invariably violent. Their nature is tied to the mountain borderlands, quick to sense human intrusion and retreat.

Konpira-bo is a yokai that embodies the history of Kotohira-gu (Matsuo-dera Konpira Daigongen) as a sacred mountain of Shugendo during the era of Shinto-Buddhist syncretism. Listed as one of the "Forty-Eight Tengu," he is revered as the great tengu commanding Mount Zozu in Sanuki. His true form is either a yamabushi who accumulated harsh austerities and transformed into a tengu, or a familiar (guardian deity) of Konpira Daigongen. This duality represents a typical structure of tengu legends in mountain beliefs across Japan. Particularly within the Konpira faith, which holds aspects of a maritime guardian and water deity, he assumes the role of warding off evil and dispensing divine punishment while enshrined in the deep mountains behind the shrine. Although Kotohira-gu is a Shinto shrine today, ascending the stone steps to the inner shrine and walking along the approach lined with ancient trees still profoundly conveys the majesty of the forest once believed to be the domain of Konpira-bo, imbued with the atmosphere of Shugendo.

A reconstruction based on Toriyama Sekien’s image and brief note. It appears as a small monk drenched by rain, emerging on rainy nights in the mountains. It softly asks passersby for offerings due to a monk, but refusal does not necessarily bring harm. Its place is tied to the sacred Shugendō ranges of Ōmine and Katsuragi, yet no verified lore links it to specific temples or persons. Later sources that say it begs for food or small coins likely simplify Sekien’s term “sairyō” (offerings), with little direct oral backing. Its wandering is said to occur only on fine-threaded rainy nights, and reports from clear nights or downpours are uncertain. Methods to banish or summon it are unknown, and meetings on mountain paths are told merely as fleeting oddities.

The legend of Kurama-yama Sōjōbō is a subject to be read with careful separation of historical fact from later accretion. The credibility of its setting rests in the history of Kurama-dera. The Kurama-buki-dera engi relates that Ganchō built a hermitage in the first year of Hōki (770) and that Fujiwara no Iseto raised the temple halls in the fifteenth year of Enryaku (796). This ancient sacred mountain holds the valley of Sōjō-ga-tani where Sōjōbō dwells, and was held to be the place of descent of Gohō Maō-son. The firm dramatization of the tale of martial transmission to Ushiwakamaru begins with the Muromachi-period Noh play Kurama Tengu. In its plot the great tengu of Kurama teaches the art of war to Ushiwaka, who, pursued by the Heike, had taken refuge at Kurama-dera; performed as a fifth-category Noh, it unfolded widely into later kabuki and ukiyo-e. Yet this transmission tale does not exist in the older Gikeiki. What the Gikeiki transmits is the tale of Ushiwaka's acquiring the books of strategy (the Rikutō and Sanryaku) treasured by the onmyōji Kiichi Hōgen—no tengu appears. The identification that binds the two, "Kurama Tengu = Kiichi Hōgen," arose in early-modern times. Its source is the jōruri Kiichi Hōgen Sanryaku no Maki (1731, premiered at the Takemoto-za), which has a scene calling Kiichi Hōgen "the tengu who long ago taught swordsmanship to Ushiwaka on Mt. Kurama." Here the Gikeiki's Kiichi Hōgen and the Noh's tengu-transmission tradition were fused into one. Thus the story widely known today—that Ushiwaka learned the art of war from the Kurama tengu—is rightly seen not as deriving from the Gikeiki, but as a layered legend that began with the Muromachi Noh and was bound to Kiichi Hōgen in the Edo jōruri. One further point to note is the relation to Gohō Maō-son. The grand present-day doctrine by which Kurama-dera links it to Sōjōbō is a modern teaching arranged only after the temple became independent of the Tendai school and founded Kurama-kōkyō in Shōwa 24 (1949)—a lineage apart from the medieval Sōjōbō tradition. The Sōjōbō of the medieval tradition was, as one of the forty-eight tengu, a master tengu who imparted the martial arts and the way of the mountains.

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.

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.

Rather than arising chiefly from oral accounts, Ouni has been recognized through a lineage of images in picture scrolls. A precursor appears as the “Wau-wau” type in Sawaki Suushi’s Hyakkai Zukan (1737), and in the late Edo Hyakki Yagyō Emaki (Oda Gōchō, 1832) it is rendered as “Uwan-uwan.” Toriyama Sekien drew on this visual genealogy, exaggerating the hair and emphasizing a fiber-bundle texture suggestive of o, then named the figure accordingly. The term o denotes a tufted bundle of ramie or hemp fibers, serving as a visual sign tied to the creature’s mass of body hair. From the Heisei era onward, commentators increasingly connected Ouni with folktales of mountain hags who comb and spin fibers, treating it as a subtype of yama-uba. Yet Sekien gives no locality or deeds, and evidence for attaching it to specific place-based traditions is scant. It is safest to regard Ouni as a yokai defined by the iconographic core of a shaggy demon-woman appearing in the mountains, loosely linked to ideas surrounding women’s fiber work in upland communities.

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.

A simian-form apparition modeled on Sekien Toriyama’s Konjaku Gazu Zoku Hyakki entry and natural-historical notes in Sino-Japanese texts. It appears on remote mountain paths, instantly voices the thoughts of woodcutters and travelers, and gauges their behavior. Disinclined to harm humans, it withdraws swiftly when sensing danger, in line with Sekien’s text. In folktales its figure varies by region—monkey, mountain man, tengu, or tanuki—but its core is “mind reading” and retreating at sudden noises. Its mind reading mirrors the other’s thoughts and repeats them, closer to a warning than provocation. It reads presences in mountain stillness yet proves vulnerable to the unexpected—sparks from a campfire or a flying splinter. The name Kakku is linked to the character 玃 through phonetic conflation, from which an independent yokai image emerged. Traditions span Chubu to Kanto, Tohoku, Chugoku, and Kyushu, telling of a being that measures the boundary between people and the otherworld in the mountains.

A baseline profile of Shidaidaka as a roadside, look-up-type apparition recorded across the Chugoku region. It resembles a human silhouette with head and shoulders dissolving into darkness, and its height stretches or shrinks in response to one’s gaze. Harmfulness varies by tale, but fear intensifies through the act of looking up. Countermeasures include keeping your gaze lowered, watching the ground, or peering between your legs, which causes the figure to diminish and dissipate. It is linked to the Mikoshi-nyudo, and tales of the similarly named “Shidai-zaka” are viewed as slope or mountain-path variants. Hunter stories connect it with the nekomata, and identifications differ by locale. Creative embellishments are common, but the core taboo warns that one’s gaze amplifies the phenomenon.

Shiramine Sagamibō is, among the Eight Great Tengu, the tengu most firmly bound to a single person—the Retired Emperor Sutoku. His image cannot stand apart from the story of Sutoku's vengeful spirit. The Retired Emperor Sutoku, defeated in the Hōgen Rebellion (1156), was exiled to Sanuki and died in the second year of Chōkan (1164) without ever being permitted to return to the capital. At his place of exile he copied out the five Mahāyāna sutras and sent them to the capital, but, suspected of a curse, had them flung back at him; in fury he swore an oath written in blood and is said to have become, while still living, a great tengu and a great demon (daimaen). Sagamibō guards the Shiramine mausoleum of this Sutoku, whom Yoritomo called "the greatest tengu in Japan." Shiramine-ji is the eighty-first station of the eighty-eight temples of Shikoku, the Shiramine mausoleum is the only imperial tomb in Shikoku, and beside it stands the Tonshō-ji-den, which enshrines the spirit of Sutoku-in. It was literature that made Sagamibō immortal. Its original source is the mid-Kamakura Senjūshō, attributed to Saigyō, whose "On the New Retired Emperor's Tomb at Shiramine" carries a tale of Saigyō mourning Sutoku's tomb at Shiramine. The Noh play Matsuyama Tengu, which dramatized it, takes Sutoku-in as the shite and Saigyō as the waki, and depicts Sagamibō as a tengu attending Sutoku. Further, the "Shiramine" of Ueda Akinari's Ugetsu Monogatari is a story in which Saigyō mourns Sutoku's spirit at the Shiramine mausoleum and converses with the wrathful Sutoku-in; Sagamibō became the being running through this lineage since the Senjūshō. The vengeful spirit and the tengu who stays beside it—the relation of Sutoku and Sagamibō is a rare point where the faith in goryō (vengeful spirits) and the faith in tengu meet. There are two theories on Sagamibō's origin: that it derives from Sagami Ajari Shōson, who sided with Sutoku in the Hōgen Monogatari, and that he was a tengu who came from Mt. Ōyama in Sagami. The latter forms a pair with the seat-transfer tradition arranged by Chigiri Kōsai—that the Sagamibō of Ōyama, in devotion to Sutoku, removed to Sanuki, and Hōkibō entered the vacant Sagami Ōyama. Either way, Shiramine Sagamibō sits at the western end of the Eight Great Tengu, transmitted at Shiramine in Sanuki as the tengu who keeps guarding the soul of Sutoku, one of Japan's three great vengeful spirits.

*Suiton* is a one-legged yokai unique to the Hiruzen Highlands, based on local folklore recorded in the *Yatsuka-son Shi*. Its name derives from the way it flies in with a "*sui*" and lands on its single leg with a "*ton*". It belongs to the lineage of mind-reading yokai like the *Satori*, reading human hearts to tear apart and devour only the wicked. On the other hand, it has functioned as a moral guardian of the land, protecting the good and keeping the evil away. The anecdote of it fleeing in terror from the sound of bamboo bursting in a fire adds a touch of comedy—showing that despite its powerful mind-reading ability, it is easily frightened by sudden noises. This perfectly illustrates its character as a local yokai that serves as both a warning and a beloved figure. Today, statues of the *Suiton* are erected in various places as a symbol of Hiruzen tourism.

The Folkloric Anomaly of the "Formless Yokai". While the basic overview highlighted the Sunakake-baba's narrative structure, this deep dive explores the profound academic significance of her "lack of visual representation." The mid-to-late Edo period saw a massive wave of yokai visualization (cataloging via illustration), spearheaded by Toriyama Sekien's *Gazu Hyakki Yagyo*. The Sunakake-baba is a remarkably rare entity that entirely missed this wave. She appears in no classical picture scrolls, and prior to Shigeru Mizuki, she was represented solely by "the sound of falling sand and the sand itself." When Kunio Yanagita explicitly noted in *Yokai Dangi* that "no one has ever seen her form," he was recognizing this visual absence as a critical academic subject. The Sunakake-baba holds a vital position in folkloristics because she preserves the primal archetype of the yokai concept: an invisible presence felt only through atmosphere, sound, and touch. Sandbar Topography and Boundary Spiritualism. It is no mere coincidence that the Sunakake-baba's primary lore locations—Nara (the Yamato River basin), Amagasaki (Ebisu Bridge, Josho-ji Temple, which sit on former sandbars), and Nishinomiya (coastal pine groves)—are all areas where "sand is exposed on the earth's surface." Sandbars, beaches, and sandy geological strata have historically commanded a strong folkloric presence as boundaries between water and land, serving as liminal corridors between humans and the otherworld. As highlighted by a Kobe Shimbun field report (December 2022), the phenomenon of sand liquefaction erupting in Amagasaki's former sandbar areas during the 1995 Great Hanshin Earthquake proves that yokai lore is deeply entwined with geological and topographical history. The Sunakake-baba is a textbook case of geographical yokai studies. The Festival Origin Theory: Mechanisms of Yokai Generation. Bintaro Yamaguchi's proposed "Hirose Shrine Sunakake Festival Origin Theory" provides a crucial perspective for unpacking how yokai are generated. A Shinto rainmaking ritual where participants throw sand to simulate rain, playfully jeering "It's the Sunakake-baba!", may have served as the incubator for the legend of a "sand-throwing hag." This illustrates the folkloric process where a yokai is generated on the margins of a festival—a phenomenon similarly observed with Setsubun demons, Obon spirits, and autumn festival tengu. It reinforces the view that religious rituals are not merely ceremonies, but active generators of folkloric imagination. Shirosaku Sawada and the Role of Local Folklorists. Dr. Shirosaku Sawada's *Yamato Mukashibanashi* is a prime example of folklore collection by local intellectuals during the pre-war and wartime eras. The development of Japanese folkloristics relied heavily on a network where local doctors, teachers, and historians collected oral traditions in the field and forwarded them to central figures like Kunio Yanagita and Shinobu Orikuchi. The Sunakake-baba's inclusion in Yanagita's *Yokai Dangi* is the direct result of this "center-periphery" collaborative research system. The excavation of local materials that supports 21st-century yokai studies is built entirely upon the painstaking groundwork laid by these local folklorists. Shigeru Mizuki's "Visual Reconstruction" and Cultural Ethics. Shigeru Mizuki (1922-2015) bestowed the Sunakake-baba with the appearance of an old woman in a kimono, creating a wholly original iconography inspired by the "Ondaiko" demon masks of Sado Island. This is a definitive example of post-war yokai culture, where mass media assigns a visual form to a traditionally formless entity. In *GeGeGe no Kitaro*, she was depicted as a righteous ally of the Kitaro family, completely erasing the localized, malicious trait of "startling humans." This Mizuki intervention sparks divided opinions in the modern history of yokai culture: while lauded for contributing to the national popularization and preservation of local lore, it is simultaneously criticized for altering the fundamental meaning of the original legend. It serves as an excellent case study for examining the ethical dilemmas of cultural production at the intersection of folkloristics and pop culture. Fukusaki, Koryo, and Hanshin: The Modern Geography of Yokai Tourism. In the 21st century, the Sunakake-baba has been aggressively developed into a tourism asset across her legendary homelands. Fukusaki Town in Hyogo Prefecture (Yanagita's birthplace) launched a "Yokai Bench" series, featuring a highly popular Sunakake-baba bench. The Sunakake Festival at Hirose Shrine in Koryo Town, Nara, garners significant tourism attention as an Intangible Folk Cultural Property. In the Hanshin cities of Amagasaki and Nishinomiya, yokai walking tours linking local history with toponymy have been established. In the context of post-war regional revitalization—where yokai function not merely as "old tales" but as modern regional brands, tourism drivers, and educational tools—the Sunakake-baba stands as an iconic symbol alongside Konaki-jiji and Ittan-momen. The Modern Paradigm Shift: From "Yokai Studies" to "Yokai Culture". The contemporary discourse surrounding the Sunakake-baba represents an intersection of two paradigms: the traditional view of treating yokai as academic subjects (folkloristics, historical verification), and the modern view of treating yokai culture as a living, breathing phenomenon (mass media, tourism, education). The modern trajectory—from the collection records of Yanagita and Sawada, through Mizuki's post-war visual reconstruction, and circulating back into 21st-century regional revitalization and tourism—proves that yokai are not "faiths of the past," but "cultural productions in progress." Modern yokai studies demands an approach that does not simply consume her as a "minor legend from Nara and Hyogo," but actively interrogates the history of knowledge, geology, and cultural production that stands behind her.

An interpretive version based on Toriyama Sekien’s Hyakki Tsurezurebukuro image and notes. It bears a raptor’s body wreathed in ghostly flame, tongues of fire trailing from beak and talons. Its glow is not a guiding light but a will-o’-the-wisp that scrambles sight and sense of direction. Sekien links it to the glow of “tengu pebbles,” weaving puzzling mountain lights into tengu lore. Said to break the chanting and meditation of yamabushi and devotees, it was feared less for wounds than for unsettling the mind and leading feet astray. Though local oral traditions are scarce, it is understood in line with common notions of phantom fires and tengu fire.

A classic case of tanuki-bayashi reported around Honjo in Edo. The sound layers like flute, drum, and shamisen, seeming to recede as you approach and shifting direction when you turn a corner. It often cuts off abruptly near waterways and moat edges. While common folk sometimes explained it as refraction and echoes caused by wind and terrain, people of the time also took it as the work of tanuki. Counted among the Seven Wonders of Honjo, it was frequently mentioned in sideshows and popular literature, with the names “Baka-bayashi” and “Tanuki-bayashi” used interchangeably. Notably, there are no accompanying sightings of a physical form, making it a sound-only apparition of high record value. Folklore warns that chasing it can leave you lost and wandering into the outskirts by dawn, so one should stop midway and cover the ears.

This edition is not about a single seat on a particular sacred mountain, but a general treatise that thoroughly unravels "what a tengu is" from the history of its iconography and types. The individual traditions of each seat are left to the page of each great tengu. The form of the tengu is not uniform. The first type is the long-nosed tengu—ruddy face and high nose, clad in the ascetic's headcloth (tokin) and the suzukake robe, a feather fan in hand and one-toothed high clogs on the feet. The second is the crow tengu, with a crow's beak and wings, grasping a sword or a vajra staff. The third are the lesser tengu called leaf tengu and wood-chip tengu, held to be weak and numerous kin. Rather than a fixed classification, these reflect the breadth of the tengu image across eras and regions. The iconography shifted over time. The Heian-period tengu was first conceived as a bird like a black kite, and the image of the crow tengu retains that vestige. The long nose grows prominent only from the late Kamakura period; the Zegaibō Emaki depicts a scene in which a tengu that had disguised itself as a human has its nose lengthen as it returns to bird form. As for the origin of the long nose, there are theories that derive it from the high-nosed Jidō mask of gigaku and link the crow tengu to the Karura (Garuda) mask, and a view that sees the long nose as an iconographic vestige of a bird's beak—but none can be called settled doctrine. It was overlaid with the god Sarutahiko, described in the Nihon Shoki as having a nose seven hand-spans long, and the custom arose of using a tengu mask for the role of Sarutahiko in festivals. The tengu's dual nature is rooted in the Buddhist notion of the way of the tengu. Because it studies the Buddhist path it does not fall into hell, and because it handles heterodox arts it cannot reach paradise either—an intermediate state, and the one who falls there was held to be the arrogant monk. The Tengu Zōshi depicts this notion as satire of the monks of the seven great temples, yet Chigiri Kōsai too warns that the simplification "only arrogant monks become tengu" goes too far. Demon though it is, once subdued it turns to guardianship, and it was held that if a Shugendō practitioner recites the Tengu Sutra he may summon the tengu of the various provinces to grant his wishes—this amplitude between guardian and demon is the very core of the tengu. The certain medieval source for the grouping called the "Eight Great Tengu" lies in the libretto of the Muromachi-period Noh play Kurama Tengu. The passage in which the great tengu calls up the tengu of the provinces he commands in geographical order—"In Tsukushi, Buzenbō of Hiko-san; in the four provinces of Shikoku, Sagamibō of Shiramine; Hōkibō of Ōyama; Saburō of Iizuna… the host of Zenki of Ōmine, Takama of Katsuragi"—shows that the Eight Great Tengu were rooted in medieval belief and performing arts, not an Edo invention. Still, the composition wavers by source, with a variant that adds Hōkibō of Ishizuchi-san; it is no fixed roster.

Hōshōbō of Mount Hiei is a great tengu who ranges the peaks of Hiei, where the capital meets the lake, dwelling between cedar and cypress crowns and the sea of clouds. Cloaked in the ridge winds of the Sannō shrines, he bears crow’s wings and a feather fan like a yamabushi’s ritual tool, said to appear at midnight with the lingering echo of a conch. His face is severe, ruddy with a high nose, eyes keen as if seeing through the ages. Yet his bearing recalls a monk, and the folds of his robes carry the scent of sutras. Named among the forty‑eight tengu of the Tengu Sutra since olden times, he guards Enryakuji’s teachings and the mountain’s vital currents, and in the era of the monastery’s ascendancy was said to guide and correct the conduct of its students both openly and unseen. Hōshōbō is not merely masterful in martial arts but cuts through the frayed edges of words to reveal a thing’s true nature. When a seeker loses their way, he thickens the mist and erases the markers, or lures an unsettled heart into the shadows of halls and pagodas—not to mislead, but to teach that wavering within is what leads one astray. When that is realized, the fog clears at once and Hiei’s ridgeline turns blade‑bright. Conversely, those who climb seeking fame and profit or who slight the Sannō deities are driven off by winds that make leaves into blades, never again permitted a frivolous ascent. Elders of Hiei whisper that Hōshōbō entrusts the essence of Lotus and Esoteric teachings to the wind, marshals flocks of birds to the cadence of chanting, and governs prayers for rain and for clearing skies. If Enryakuji’s bell tolls strangely, it is a sign of his feather fan stirring on the heights, and there were nights when sutra characters trembled across the lake’s ripples. At times he appears at a young ascetic’s bedside, delivering a single thunderous admonition that severs the root of delusion, leaving at dawn a single drop of white dew—medicine when diligence holds, poison when sloth prevails. He most abhors when urban rumors and power struggles spill onto the mountain, and bears an art that stills the blades of speech. When people wound each other with slander, a downslope wind rattles the town eaves and falsehoods collapse under their own weight; thus those who guard their tongues gain his protection. Yet he shows no mercy to those who hide pride behind practice: he lightens their footsteps until they lose the ground and wander forbidden paths of empty theory, and only when they admit their fault do their feet return to earth. On nights when the bush warbler in Hiei’s forest falls suddenly silent and distant thunder rings pure, Hōshōbō is near. If pilgrims bare their heads and pay full respect before the Sannō, the ridge wind softens and a single shaft of light breaks the clouds. This is called the Return of Hōshō—a sign that prayers in the mountain have been rightly answered. Hōshōbō is both guardian of the mountain and tester of the teaching; fear becomes reverence, and reverence opens the way. Only those who grasp this find his wings a sheltering shade for the road.

Kakukai-bō of Yokogawa is said to be a tengu variant who turned from human monk to winged guardian of the Dharma from the late Heian into the early Kamakura era. Once a virtuous priest of deep Shingon lineage, he ran himself ragged settling mountain disputes until he grasped a boundary no worldly rule could protect, becoming a winged keeper of sacred law. In Kōya’s inner precincts, they tell how one night a gale whirled through a hall and the middle gate shuddered, then its doors shed their hinges, unfurled as twin feathers, and split the black clouds to fly off. Those doors became Kakukai-bō’s wings. Ever since, he appears with the comings and goings at temple gates, raising a fierce wind before those who disturb the rule and presenting a single line of precept. He resembles a karasu-tengu, yet his face keeps the gaunt trace of an old monk and his long nose curves like a mountain ridge. His feathered robe echoes priestly vestments, layered in cinnabar and ink, its cuffs frayed like the edges of ancient sutras. He carries a feather fan akin to a monk’s staff, and when he sweeps it, seed-syllables rise like chaff off paper, racing along the ground as ropes of warding. He speaks sparingly, but his words hang like a bell’s aftertone, stopping the feet of those who have strayed. He guards the mountain’s thresholds—the shrine and temple gates, the bends of approach paths, the joins of ridge and valley—where human law brushes mountain law, serving as their mediator. When a practitioner keeps purity, he lets fall a single white feather from the cloudbreak as a sign of safe passage. But if pride sprouts, the vigil lamp flickers once and a cold wind runs down the back. Feeling this thrice, one must follow his guidance to descend the mountain or doff one’s robe and return to first intent. He also teaches the ‘Doctrine of Drying’: to clear the heart, remove needless damp—a metaphor tied on the mountain to drying beans for stores and keeping offerings pure. Though unproven, it stands as a sign of turning the mountain’s rigor into daily sustenance. Late at night when mist pools in the valleys, he patrols with a train of crows. They are his eyes and ears, giving short signals to those swayed by rumor. Read rightly, the signs lead one off the wandering path, read wrongly, one circles the same ground three times. This is called Kakukai’s Rounds, and on the third turn, if one straightens the crook in the heart, the eastern ridge pales and the path opens naturally to the main gate.

The tengu do not stop at the Eight Great Tengu. Each of the sacred mountains of the provinces was believed to have its own great tengu, and the early-modern esoteric prayer-scripture the Tengu Sutra lists their representatives as forty-eight seats—the "Forty-Eight Tengu." This edition is an overview that surveys the full roster and the provenance of the scripture itself. The Tengu Sutra is an esoteric, Shugendō-lineage prayer text said to have been compiled in the Edo period. It is not an orthodox sutra of the Buddhist canon, but belongs to the lineage of incantation-scriptures that a yamabushi recites in his devotions to summon (invoke the descent of) the tengu of the sacred mountains of the provinces, borrowing their numinous power to pray for the dispelling of demons, the subjugation of enemies, and the fulfillment of all wishes. The text begins with the chant "Homage to the great tengu and the small tengu," lists the names of the various tengu, then gives the total of the tengu as "one hundred twenty-five thousand five hundred in all," and closes with the mantra "On aromaya tengusumanki sowaka." This "one hundred twenty-five thousand five hundred" is not a real count but a symbolic number representing innumerable tengu, and the forty-eight seats named by their proper names are positioned as the representatives among them. As for the transmission of the manuscripts and printed editions of the Tengu Sutra, there are philological studies such as Takahashi Sei's "The Tengu Sutra: Its Present State and Whereabouts" (2016), and it is difficult to fix the date of compilation strictly to a single point. The roster of the Forty-Eight Tengu runs in the form of "bō" titles (sacred-mountain name + the name of the bō). The opening begins with the great tengu of the Kinai—Atago-san Tarōbō, Hira-san Jirōbō, Kurama-san Sōjōbō—and is followed by the tengu of the Shugendō sacred mountains across the land such as Fuji, Nikkō, Haguro, Akiba, Hikosan, and Ishizuchi. Below are listed all forty-eight seats, collated against two confirmable lines of sources, together with the bō title, sacred mountain, and province (present-day prefecture). ★ marks the Eight Great Tengu that have their own pages in this encyclopedia. 1. ★Atago-san Tarōbō (Mt. Atago, Yamashiro / Kyoto) 2. ★Hira-san Jirōbō (Mt. Hira, Ōmi / Shiga) 3. ★Kurama-san Sōjōbō (Mt. Kurama, Yamashiro / Kyoto) 4. Hiei-zan Hosshōbō (Mt. Hiei, Yamashiro / Kyoto) 5. Yokawa Kakkaibō (Yokawa, Mt. Hiei, Yamashiro / Kyoto) 6. Fuji-san Daranibō (Mt. Fuji, Suruga / Shizuoka) 7. Nikkō-san Tōkōbō (Mt. Nikkō, Shimotsuke / Tochigi) 8. Haguro-san Konkōbō (Mt. Haguro, Dewa / Yamagata) 9. Myōgi-san Nikkōbō (Mt. Myōgi, Kōzuke / Gunma) 10. Tsukuba-san Hōinbō (Mt. Tsukuba, Hitachi / Ibaraki) 11. ★Hiko-san Buzenbō (Mt. Hiko (Hikosan), Buzen / Fukuoka) 12. Ōhara Sumiyoshi Kenbō (Kengamine, Mt. Daisen (disputed), Hōki / Tottori (tentatively identified)) 13. Etchū Tateyama Nawadarebō (Mt. Tate, Etchū / Toyama) 14. Amanoiwafune Dantokubō (Amanoiwafune, location unknown) 15. Nara Ōku Sugisakabō (unknown, location unknown) 16. Kumano Ōmine Kikujōbō (Kiku-no-iwaya, Mt. Ōmine, Yamato / Nara) 17. Yoshino Minasugi Kozakurabō (Mt. Yoshino, Yamato / Nara) 18. ★Nachi Takimoto Zenkibō (Nachi Takimoto, Kii / Wakayama) 19. Kōya-san Kōrinbō (Mt. Kōya, Kii / Wakayama) 20. Niitayama Satokubō (Mt. Niita (disputed), Kōzuke / Gunma (tentatively identified)) 21. Kikaigashima Garanbō (Kikaigashima, Satsuma / Kagoshima (tentatively identified)) 22. Itatōyama Tondonbō (Mt. Itatō, location unknown) 23. Saifu Takagaki Kōrinbō (Mt. Kamado (Mt. Hōman), Chikuzen / Fukuoka (tentatively identified)) 24. Nagato Fumyō Kishukubō (unknown, Nagato / Yamaguchi (tentatively identified)) 25. Tsudoki Oki Fugenbō (Oki Island (disputed), Oki / Shimane (tentatively identified)) 26. Kurokenzoku Konpirabō (Mt. Zōzu, Sanuki / Kagawa) 27. Hyūga Obata Shinzōbō (unknown, Hyūga / Miyazaki (tentatively identified)) 28. Iōjima Kōtokubō (Iōjima, Satsuma / Kagoshima (tentatively identified)) 29. Shiōzan Rikyūbō (Mt. Shibi, Satsuma / Kagoshima (tentatively identified)) 30. ★Hōki Daisen Seikōbō (Mt. Daisen, Hōki / Tottori) 31. Ishizuchi-san Hōkibō (Mt. Ishizuchi, Iyo / Ehime) 32. Nyoigatake Yakushibō (Nyoigatake, Yamashiro / Kyoto) 33. Tenmanzan Sanmanbō (Mt. Tenman (disputed), Mino / Gifu (tentatively identified)) 34. Itsukushima Sankibō (Mt. Misen (Itsukushima), Aki / Hiroshima) 35. Shiragayama Kōshakubō (Mt. Shiraga, Tosa / Kōchi (tentatively identified)) 36. Akiba-san Sanshakubō (Mt. Akiba, Tōtōmi / Shizuoka) 37. Takao Naigubu (Mt. Takao, Yamashiro / Kyoto) 38. ★Iizuna Saburō (Mt. Iizuna, Shinano / Nagano) 39. Ueno Myōgibō (Mt. Myōgi, Kōzuke / Gunma) 40. Higo Ajari (Mt. Kinpō (disputed), Higo / Kumamoto (tentatively identified)) 41. Katsuragi Takamabō (Mt. Kongō (Katsuragi), Yamato / Nara) 42. ★Shiramine Sagamibō (Shiramine, Sanuki / Kagawa) 43. Kōra-san Chikugobō (Mt. Kōra, Chikugo / Fukuoka) 44. Zōzu-san Kongōbō (Mt. Zōzu, Sanuki / Kagawa) 45. Kasagi-san Daisōjō (Mt. Kasagi, Yamashiro / Kyoto) 46. Myōkō-san Adachibō (Mt. Myōkō, Echigo / Niigata) 47. Ontake-san Rokkokubō (Mt. Ontake, Shinano / Nagano) 48. Asamagatake Kinpeibō (Mt. Asama, Kōzuke / Gunma (tentatively identified)) Three cautions are needed in reading this roster. First, the bō titles (the names of each seat) agree across multiple sources and are reliable, but errors mixed into secondary web information mar the identification of the province and prefecture. For instance, Mt. Shibi is in Kagoshima Prefecture (Satsuma), and "Hyūga" is the old province name of Miyazaki Prefecture—misattributions confusing these with places in the Kantō or Tōhoku are in circulation. In this roster, "tentatively identified" is appended to seats whose identification has latitude, and "location unknown" to seats whose whereabouts cannot be confirmed among the sources. Second, there are seats such as Amanoiwafune Dantokubō, Nara Ōku Sugisakabō, and Itatōyama Tondonbō whose location multiple sources hold to be "unknown," and no place name has been forced upon these. Third, there is variation between the bō titles of the Eight Great Tengu and the wording of the Tengu Sutra text. For example, the Ōyama Hōkibō of the Eight Great Tengu appears in the text as "Hōki Daisen Seikōbō," and Ōmine Zenkibō appears in the "Nachi Takimoto Zenkibō" / "Kumano Ōmine Kikujōbō" line of wording. The Eight Great Tengu are commonly explained as eight representative seats drawn from among these forty-eight, but the bō titles do not agree word for word. The framework of the Forty-Eight Tengu shows most plainly that the tengu was not a solitary yokai but a deity of mountain worship seated throughout the sacred mountains of the whole country. Chigiri Kōsai, who compiled the study of tengu, likewise organized these mountain tengu into a single system. Each seat of the Eight Great Tengu (★) is treated in detail on its own page, but they too are simply the especially high peaks within this sea of one hundred twenty-five thousand five hundred tengu.

Based on records from Horie Village in Awa Province, this version organizes the image of the Itobiki-Musume as a young woman operating a spinning wheel by the roadside. The moment someone looks her way, she transforms into an old crone and bursts into loud laughter. No harm beyond revealing her true form is reported, and she neither touches nor pursues people. Stories most often place her from dusk to midnight in spots where foot traffic thins—village outskirts, field paths, and crossroads. Folklorically she belongs to roadside怪異 tales, told as a warning not to be deceived by looks and not to dawdle off one’s route. The trigger for the change is acts like “staring” or “approaching,” and the silent switch to an old-woman figure is the core of the fright. The spinning wheel is an everyday tool, and her realistic working motions heighten the uncanny shock of a chance encounter. Parallels exist outside the region, but the named example from Awa is the best known.

A version organized from folklore materials of a child-shaped mountain spirit seen in the eastern Tanzawa mountains. Generally harmless, it simply follows quietly behind travelers, yet at times steps ahead at forks to guide them onto the right path. It wears rough straw matting or homespun, sometimes pelts, blending into the forest’s shadow and vanishing when one turns back. It is said to appear most often in the afternoon, and at night to carry a small light like a lantern. Those who meet it repeatedly often think of lost children and leave rice balls, yams, sweets, or dried persimmons on rocks or stumps as offerings. Some accounts say it fades away as one nears the villages, others that it withdraws when called to at night, and none describe it as vengeful. Rooted in overlapping ideas of mountains and the dead, it stands as a symbol of the boundary nature of the mountain realm.

The Tsuchinoko, as a mallet-bodied strange snake bounding along mountain paths, does not appear as a giant snake god, but as the very unease lurking in the grass at one's feet. When people see a snake, they normally expect it to be long and slender. However, in Tsuchinoko testimonies, that expectation is immediately shattered. The form—a body the size of a beer bottle, a short tail, a triangular head, and a body glowing gray or dark brown—betrays snake-likeness while still being a snake. Here, "yokai-likeness" is born. The anomaly of its appearance does not reside in flashy horns or flames, but in an awkward thickness that slightly overflows even when mountain dwellers try to explain it using everyday metaphors. The lore surrounding its movements also separates the Tsuchinoko from ordinary snakes. In the compilation by Higashishirakawa Village, characteristics like rolling, moving back and forth without slithering, standing vertically, and jumping are listed. While slithering is understood as the fundamental locomotion of a snake, the Tsuchinoko deviates from this: it moves straight like a stick, rolls like a cylinder, and springs like a coil. Because not only its shape resembles a mallet, but its movements take on a tool-like stiffness, the observer cannot instantly distinguish whether they "saw a living creature" or "something rolled by." This unidentifiable timeframe transforms the eyewitness account into a yokai tale. Stories of the Tsuchinoko's venom or swiftness serve to compress the dangers of the wilderness into a small body. While it is not massive enough to swallow a village like an Orochi, it is too eerie to approach and too fast to catch. The fact that both venomous and non-venomous theories are listed together is also important; the folklore does not converge into a single ecological encyclopedia, but wavers depending on the viewer's fear and sense of distance. The misidentification of real animals, expectations for unknown creatures, and wariness of dangers encountered in the mountains overlap under the same name. The Tsuchinoko culture of Higashishirakawa Village transformed the yokai from something to "see" into something to "search for." In the Tsuchinoko Festa, searching, treasure hunting, and hunting rallies are combined. This is not mere tourist commercialization. The yokai is not detached from the land and consumed; rather, through the village's topography, riverbanks, grass, and gatherings of people, the possibility that "it might be there" is re-enacted every year. The Tsuchinoko is not weak because it isn't caught. By not being caught, it invites all participants into an unfinished story. When viewed in the genealogy of snake-type yokai, the Tsuchinoko's position becomes even clearer. The Yamata-no-Orochi is a mythological calamity, and giant snakes easily become symbols of spiritual power dominating water or mountains. Tales of venomous snakes like the Shichiho-hebi (Seven-Step Snake) sharply indicate distance and taboos. In contrast, the Tsuchinoko does not sit at the center of mythology, but remains at the edges of testimony. It does not demand grand rituals, nor does it systematize curses; it simply multiplies through the short verbs of "saw," "fled," and "searched." Therefore, it meshes well with modern search culture. The very act of typing in a name, searching for images, and reading capture info has become an extension of the physical gesture of peering into the bushes on a mountain path. The inconsistency of its name also supports the Tsuchinoko's yokai nature. Names like Tsuchinoko, Tsuchi-hebi, Nozuchi-hebi, and Bachi-hebi do not fix the subject like a scientific name, but preserve the land where it was seen, the angle from which it was viewed, and the impression of the storyteller. Look at its thickness and it becomes a mallet; look at its movement and it becomes a snake; look at its ungraspable true nature and it becomes a cryptid. Precisely because the name wavers, the Tsuchinoko spread not as a single rare beast, but as a generic term for the inexplicable moments people encountered in the wilderness. Read in this form, the Tsuchinoko simultaneously possesses the romance of a cryptid and the narrative tenacity of a yokai. If one only asks whether it really exists, the answer quickly hits a dead end. However, when asking why people cannot forget that short, thick shadow, why villages turn it into a festival, and why they continue to place bounties on something that cannot be caught, the Tsuchinoko suddenly becomes a profound yokai. The small strange snake bounding down the mountain path sets human imagination in motion before providing evidence, making us go out once more to search for what we could not see.

At dusk on a mountain road, a branch creaks once overhead. You look up, but the canopy has already dissolved into darkness. The moment you begin walking again, laughter rings out and an enormous severed head plunges down with the speed of a well bucket. In this form, Tsurube-otoshi turns the simple act of falling into terror. Two scenes from the traditions of the former Sogabe Village, preserved in *Kuchi Tanba Kōhishū*, are especially important for understanding this image. The presence in the kaya tree at Hōki calls, “Is the night work done? Shall I lower the bucket? Creak, creak,” descending with laughter before climbing back into the tree. From an old pine at Tera, by contrast, a severed head drops and eats people. The detail that it stays away for two or three days after feeding makes it more than a passing illusion. It was imagined as a hungry predator lying in wait along the community's night roads. Placed side by side, the two stories reveal a method of attack. First, a voice or the sound of a branch draws the traveler's attention overhead. Then the thing closes the distance at once from the darkness of the canopy. After the attack, it rises again as though a rope were hauling up a well bucket. The name describes its motion more precisely than its appearance. The everyday movement of a bucket at a familiar well, transferred to an old tree at night, becomes a dreadful question: what is about to fall onto the person below? The giant severed head is not Tsurube-otoshi's only form. Hokuriku traditions also record a being that drops the bucket itself from a tree, one that forces travelers into a riddle-like exchange, and one that carries anyone who touches it into the sky. The head is a forceful image connecting the man-eating traditions of Tanba with modern yokai art, but it cannot stand for every regional account. The form described here brings one strand of the wider tradition into focus: Tsurube-otoshi as a predator hidden in an old tree. Nor can its difference from Tsurube-bi be decided by appearance alone. The early-modern Tsurube-oroshi and Sekien's Tsurube-bi center on uncanny fire descending from a tree. The severed-head form instead centers on voice, sudden descent, and predation. Even so, both inhabit old trees and move up and down like a well bucket. No source shows a flame simply transforming into a face, but the evidence is equally insufficient to call the traditions unrelated. A sounder reading is that a shared older name and motion acquired different bodies in different local narratives. Mizuki Shigeru's 1992 original painting *Tsurube-otoshi* clearly embodies the modern impression of an enormous face appearing in a tree. A giant head communicates danger immediately and makes the instant of descent easy to visualize. It was therefore more readily remembered in manga, encyclopedias, and three-dimensional figures than an invisible voice or an ordinary bucket. Yet returning to the local tales after seeing the face lets us hear what the picture cannot show: a question about finished night work, the creak of a rope, the movement of leaves, and a presence drawing closer from somewhere above. Tsurube-otoshi's true domain is not the giant face alone. It is the instant in which a person cannot help but look up.

A reconstruction based on imagery from picture scrolls. It kneels low to the ground, the body slack, skin ashen-brown mottled with pale spots. The face is indistinct, the line between mouth and nose blurred, with a damp sheen. In keeping with rare records that preserve little more than its name, no guiding motive is assigned. Said to be seen as a crouching lump by mountain paths or along thickets, it inspires awe and a sense of distance. If approached, it withdraws before its form can be fixed, making pursuit difficult. No confirmed harm is attributed to it, and encounter tales remain general.