Ōkubi

Sources present two overlapping origin framings rather than a single canonical origin story. In Edo-period anecdotal collections Ōkubi appears as a named yōkai encountered in households or at walls, treated as an apparition-type; some commentary in modern summaries characterizes Ōkubi as arising when human vengeful spirits or obsessive states are externalized into yōkai. A separate interpretive note reported in sources suggests that at least some accounts treat Ōkubi as a satirical invention aimed at monks who violated their precepts, but that reading is cited as an uncertain or secondary explanation rather than a universally attested origin.

Classical descriptions and images emphasize a mostly huge female head: an enormous old woman's face, sometimes shown with the cosmetic convention of painted-black teeth associated with married women. Edo-period anecdotes relate tactile details — e.g., a giant face in a storage room that felt sticky when touched and did not react when poked with tongs; a haiku-poet's account describes an Ōkubi roughly two meters high appearing atop a wall on a rainy night. Modern literary authors (Natsuhiko Kyogoku) depict Ōkubi as a morgue vision that can transmute into the faces of sexual partners, and manga artists (Shigeru Mizuki) have further visualized grotesque augmentations (limb degeneration, enlarged head, sunken eye) as fictional elaborations; these modern features are artistic reinterpretations rather than classical folklore attestations.

Classical accounts attribute localized harmful effects to an Ōkubi: the haiku-poet anecdote reports an Ōkubi that 'blew' on a person and caused the touched part to turn yellow and swell, an injury later treated with a medicated bath. Edo-period tales also give corporeal-seeming qualities (sticky surface; nonresponsive to poking). Modern literary and manga sources expand Ōkubi's capacities for psychological manifestation (transforming into faces of sexual partners, embodying sexual guilt) and, in specific fictional works, grant additional supernatural powers (e.g., bone-telekinesis, air-manipulation) — these latter abilities are explicitly modern fictional elements and are not documented in the classical anecdotal material.