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TRANSLATION: one-legged bellows
HABITAT: mountains
DIET: unknown, but kills humans one day per year

APPEARANCE: Ippondatara has one thick, trunk-like leg and a single saucer-like eye. It lives deep in the mountains of Japan. It is especially well-known in the mountains bordering Wakayama and Nara Prefectures (old Kii and Yamato Provinces), though sightings have been reported in other neighboring prefectures as well.

BEHAVIOR: Ippondatara is a shy yōkai, and tends to stay away from inhabited areas. It moves about by hopping around and doing somersaults. It avoids humans, though on winter days it is not uncommon to find the unique prints of this yōkai’s large, single foot in the snow.

INTERACTIONS: While it is mostly harmless, once per year on December 20th, the ippondatara turns violent. Those entering the mountains on that day who run into the ippondatara are squashed flat under its powerful foot. Because of this, December 20th is considered an unlucky day in the areas where this yōkai lives. People stay out of the mountains then.

ORIGIN: The name ippondatara comes from tatara, the bellows that a blacksmith would use in the old days. This yōkai is said to resemble a master blacksmith who lost the use of one eye from years of starting at the intense flames, and lost the use of one leg from years of heavy work pumping the bellows.

There are many theories about the origin of this yōkai. In some villages, it is considered to be a cousin of a certain breed of kappa called gōrai which—every winter—transform from river spirits into mountain spirits called kashambo until they return to the rivers in spring. Ippondatara is said to be a kind of kashambo.

Other explanations describe the ippondatara as the ghost of a woodcutter who cut off one of his legs in penance for some crime. Or it may be the ghost of a famous one-legged, one-eyed robber named Hitotsudatara who lived in the mountains of Wakayama and had supernatural strength. It may even be the ghost of a giant boar who used to roam the mountains killing hunters. A high priest was able to bind the boar’s spirit and keep it from harming people, but the conditions of the magic that binds this ghost allow it to roam free one day per year—on December 20th.

It has also been suggested that it is a kind of mountain kami which was corrupted over the ages and became a yōkai. A single eye is a common feature among mountain spirits, and other one-eyed yōkai (such as hitotsume kozō) originated as mountain kami as well.



TRANSLATION: mountain sprite
ALTERNATE NAMES: sanki (mountain demon)
HABITAT: mountains
DIET: crabs and frogs

APPEARANCE: Sansei are small humanoid spirits that live deep in the mountains. They range in size anywhere from about one foot tall, to three or four feet tall. Sansei’s most noticeable trait is their single leg, which is turned around backwards. They are known as the leaders of all animals which live in the mountains, and their diet mainly consists of frogs and stone crabs, of which they are particularly fond and enjoy broiling with salt.

INTERACTIONS: Sansei occasionally sneak into woodcutters’ houses and mountain huts to steal salt, which they use to flavor the crabs that they eat. Though not very aggressive, they do sometimes attack humans. When this happens, if one calls out, “Hiderigami!” the sansei will flee in terror. However, if one calls out, “Sansei!” instead, that person will meet some horrible fate, such as falling ill or having their house catch on fire.



TRANSLATION: drought spirit
ALTERNATE NAMES: batsu, kanbo (“drought mother”), shinchi
HABITAT: mountains
DIET: moisture

APPEARANCE: Hiderigami is a grotesque, hairy humanoid which stands between two and three feet tall. It has a single eye on the top of its head. It only has a single arm and a single leg, although it can run as fast as the wind. All hiderigami are female.

BEHAVIOR: Hiderigami are rarely encountered by humans. They live deep in the mountains and only rarely travel out into human-inhabited lands, but when they do their presence can be strongly felt over a wide area. A hiderigami’s body exerts such a strong heat that everywhere it goes the ground dries up, clouds fail to form, and rain cannot fall. Despite the incredible danger that they pose, it is said that throwing a hiderigami into a toilet will kill it.

ORIGIN: Hiderigami originated in southern China, and come from a goddess. Their origin is recorded in some of the oldest ancient Chinese records. When the legendary Yellow Emperor of China fought the warlord Chi You, he summon a powerful goddess named Batsu to aid him in battle. Batsu contained an supernatural heat inside of her, and when she released her power, the battle was quickly and decisively won in the emperor’s favor; however, she had used so much of her power up that she was unable to return to Heaven or contain her heat. While Batsu was nearby, the waters all dried up and rain would not fall, and so her presence became a terrible problem for the emperor. Unable to kill her or to send her back to heaven, the emperor exiled the goddess to a far-away mountain and forbade her to return. Whether Batsu became the mother of the hiderigami or became corrupted and transformed into this yokai herself is unknown.