A skeletal yokai illustrated by Toriyama Sekien in Konjaku Hyakki Shūi. It depicts a white-haired skeleton in white robes dangling from a well’s bucket rope, captioned, “Kyōkotsu is a white bone from within a well.” Often read as a being steeped in rancor, but Sekien’s text gives no details of its nature or backstory, and no historical oral name is attested. Scholars view it as a pictorial invention linked to puns, proverbs, or dialectal wordplay.
Folklore & Legends
Later interpretations claim the bones abandoned in a well manifest with vengeful intent, bringing misfortune to those who use the well or revealing where a body was discarded. However, outside Sekien’s print there is no fixed folk name “Kyōkotsu,” and it fits broadly within Japanese fears of skull-and-bone apparitions. Explanations center on reading the image through skeleton motifs and dialect associations; concrete incidents remain unknown.
Yokai Cards2
Kyōkotsu (Mad Bone) across multiple art-style decks
A form named and illustrated by the Edo-period artist Toriyama Sekien, who depicted white bones in a well as “Kyōkotsu.” The motif shows a skeleton in white garb linked to a bucket rope, rising from the well’s depths, often accompanied by phrases stressing violent grudge. Oral tradition for a proper name is sparse, and the figure likely arose from the linkage of image and words (dialect “kyōkotsu,” the term for bare bones “髑髏/白骨”). Later writers attached explanations such as “bones discarded in a well” or “spirits of the drowned or those who fell,” but primary sources do not fix its nature. Its eeriness as a skeletal image is emphasized, foregrounding symbolism over spiritual rank.
Character Profile
This section is our own creative profile for storytelling. It is not historical fact or scholarship.
The diagram below is a diagnostic evaluation chart for Sekien Zue Version. The higher the value of each item, the stronger that characteristic is expressed.
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