TRANSLATION: demon bear
HABITAT: mountain forests
APPEARANCE: A bear which has lived for a very long time and transformed into a yōkai is called an onikuma, or demon bear. Onikuma continue growing and reach sizes much larger than even the largest natural bears. They walk on two legs and are large enough to carry off cows and horses, and can easily move aside boulders than ten men could not budge. They are so powerful that they can even crush a monkey with the palm of their hand.
BEHAVIOR: Onikuma behavior is very similar to that of ordinary bears. They live deep in the mountains, far away from humans. They are nocturnal. They hunt and scavenge and are able to eat just about anything. They rarely venture out of their habitats, but like ordinary bears, will occasionally emerge from the forests into villages to look for food.
INTERACTIONS: Due to their reclusive nature, encounters between onikuma and humans are very rare. When they do happen, however, they are often violent. Onikuma sometimes wander into human-inhabited areas when there is easy food to be had—this usually means livestock. Onikuma are capable of stealing cows and horses and walking off into the forest with them in hand. When this happens, the villagers have no choice but to try to hunt and kill the onikuma.
To hunt an onikuma, special tactics are required. First, hunters use strong timber to build a sturdy wooden structure resembling a square well casing. This is covered with wisteria vines and inserted to plug up the entrance of the onikuma’s den. Then, sticks and brush are pushed in through the narrow openings around the den plug. The onikuma will pull these things into the den and pile them up in the back, like a nest. As more and more are inserted, the den will fill up until there is no more space, and the onikuma will push its way out through the vine-covered plug. Then, it is stabbed with a long spear and shot with a rifle.
Such a tactic was used during the Kyōhō era (1716-1736) to kill an onikuma. The hide taken from the beast was large enough to cover more than six tatami mats.
TRANSLATION: promoted giant triton
HABITAT: migrates from mountains, to valleys, and finally to seas
APPEARANCE: Like many animals, giant tritons (Charonia tritonis)—a kind of sea snail similar to a conch—can turn into yōkai after living for a very long time. When a giant triton reaches an age of several thousand years old, it turns into a draconic creature called a shussebora.
BEHAVIOR: Long ago, it was believed that giant tritons lived deep in the mountains. They spend their lives buried under the earth. They grow larger and larger, until after three thousand years they descend from the mountains into the valleys during landslides. They spend three thousand more years living near human villages, until they finally burrow into the sea. After three thousand more years underwater, they transform into a mizuchi—a kind of sea dragon.
INTERACTIONS: Because they spend their years buried in the earth or deep in the sea, shussebora very rarely ever interact with people. However, the caves they leave behind during their migrations serve as a testament to their existence. All over Japan, after landslides people have discovered large caves which shussebora were thought to have lived in. These discoveries were even documented in newspapers during the Meiji period.
The flesh of a shussebora was said to bring very long life to anyone who eats it. However, as there is no documented evidence of this, and nobody who has actually eaten a shussebora has come forth, this is thought to be just rumor.
ORIGIN: Because of the ambiguous nature of these creatures—the rumors about their life-giving meat, and the lack of any evidence other the caves they allegedly lived in—the phrase “hora wo fuku” (“to blow a conch shell”), meaning “to brag,” is said to have originated from this yōkai.
TRANSLATION: none; just the name for this monster
ALTERNATE NAMES: yamajiji, satorikai
HABITAT: deep in secluded mountains
DIET: life force (in the form of the breath of sleeping humans)
APPEARANCE: Yamachichi live in northeastern Japan and originally come from bats. A long-lived bat transforms into a nobusuma, which then, after many more years, transforms into a yamachichi. These yokai resemble monkeys with pointed mouths and sucking lips.
BEHAVIOR: Yamachichi live deep in the mountains and pay visit to houses late at night. They steal the breath from their sleeping human victims, sucking it out of their mouths with their pointed lips. After sucking away all of their victim’s sleeping breath, the yamachichi taps its victim on the chest, and then flees into the night. A human who has had his or breath stolen this way will die the next day. However, if a yamachichi should be caught in the act of stealing someone’s breath (either by the victim or by another witness), it will flee, and their victim will actually have their life span greatly increased instead.
ORIGIN: The name yamachichi only appears in Ehon Hyakumonogatari, an Edo period yokai bestiary, and thus very little is known about them. The characters used to write the name literally mean “mountainous region” and “breast” or “milk,” but these are most likely ateji — characters assigned phonetically without regard to the original meaning of the word. The original meaning of the name is mysterious and the only explanation given is that they are called yamachichi because they live hidden away in the mountains.
Because they are very similar in shape to satori, yamachichi are often confused with this yokai, and have picked up the alternative name satorikai.