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TRANSLATION: crazy bones
HABITAT: wells
DIET: none; it is powered solely by vengeance

APPEARANCE: A kyōkotsu is a ghostly, skeletal spirit which rises out of wells to scare people. It is wrapped in a ragged shroud, with only its bleached skull and tangled hair emerging from its tattered clothes.

BEHAVIOR: Kyōkotsu are formed from bones which were improperly disposed of by being discarded down a well. The bones may come from a murder or a suicide victim, or someone who died after accidentally falling into a well. The lack of a proper burial—and the egregious disrespect shown by discarding bones in this manner—creates a powerful grudge in those bones. This transforms the deceased into a shiryō. Like other ghosts, they pass their grudge on to those they come in contact with. A kyōkotsu lies at the bottom of its well until it is disturbed, then it rises up to curse anyone unfortunate enough to be using the well.

ORIGIN: Kyōkotsu was invented by Toriyama Sekien for his book Konjaku hyakki shūi. In his description, he writes that this yōkai’s name is the origin of the word kyōkotsu, which means fury and violence. While there is a word in a local dialect of Kanagawa which does match this description, there is no evidence actually linking it to this yōkai. It is more likely that Toriyama Sekien—who was fond of wordplay—actually created this yōkai based on words in local dialects and just made up a false etymology to make the story more interesting.



TRANSLATION: none; just the name for this monster
ALTERNATE NAMES: ayakashi, ikuji
HABITAT: open seas
DIET: unknown; but it is big enough to eat anything it wants

APPEARANCE: Ikuchi are colossal sea monsters that roam the open seas off the coasts of Japan. They appear in numerous stories from the Edo period, where they are described as enormous fish or monstrous serpents of some kind. Their bodies are covered in a slippery oil, which sheds as they swim the ocean.

INTERACTIONS: When an ikuchi’s path crosses a boat’s, the sea monster envelopes the boat in its tentacle-like body. It slithers over the sides and across the deck, slowly sliding its whole body over the boat. Ikuchi are so long—many kilometers, by some accounts—that it can take hours for an entire one to slither over a boat. On a few occasions, boats have been tangled up in this monster for days. During this time, sailors must constantly bail the monster’s oily slime off of the deck to avoid being capsized by the heavy goo.

ORIGIN: An ikuchi is depicted in Toriyama Sekien’s bestiary Konjaku Hyakki Shūi, where it is called ayakashi. This yōkai is often referred to by that name. Ayakashi is more commonly used as a term for other strange creatures and supernatural phenomena and has nothing in particular to do with ikuchi. Toriyama Sekien may have just been listing the ikuchi as an example of an ayakashi. For whatever reason the name stuck.