Toriyama Sekien gave this one a face and a name and then nothing else. That was normal in his first book, where most entries carry only a name. The ouni got only a picture: a hair-covered woman with a mouth split wide toward each ear, and the two characters 苧うに written beside her. No story. Scholars have spent the two and a half centuries since trying to work out what she was supposed to be.
What does it look like?
Sekien's ouni has a face like a kijo — a demon-woman, mouth split open to the ears. It sits on a body entirely covered in long hair. There is no shell, no obvious animal ancestor, just a human shape gone shaggy and wrong.
The hair is also the pun. 苧 (o) means ramie or hemp fibre — the raw plant thread spun into cloth in premodern Japan — or a bundle of that fibre. The kana part, uni, is harder to explain. Researchers say Sekien chose 苧 because her hair and fur look like heaped-up fibre.
A yokai with no story — until one got attached
Because Sekien left the ouni undocumented, later writers went looking for a folk tradition to match the picture, and one earlier source offered a lead: Sawaki Sūshi's 1737 scroll Hyakkai Zukan shows the same hairy figure under the name wauwau. Sekien most likely copied it from such scrolls. It has the same blank-slate problem — an image everyone had inherited and no one could explain.
A 1978 yokai guide by Satō Arifumi said she ate people who came to drink at mountain streams. That idea seems to come from the picture alone. The identification that stuck came later. It moved the ouni toward a better-documented figure: the mountain-dwelling yamauba who helps village women spin thread.
The yamauba's thread
Tales of a yamauba spinning fibre are found in many places. One often cited comes from Kotaki village in Echigo — today Itoigawa, Niigata. Village women are gathered, twisting hemp fibre into thread. A yamauba appears and says, "I'll spin for you too." She chews the hemp and draws out thread at a speed no human could match. She spins a huge amount, then leaves the house. The women follow her, but she has vanished. In Sekien's picture, the hair is the same substance she spins, as if she is made out of her own trade.
Where it comes from
Two separate things got folded into one yokai here, which is why the ouni feels harder to pin down than most of Sekien's subjects. The picture is 1776; the hemp-spinning yamauba is a separate folktale. Writers from the Heisei era (1989 on) noticed that both involve the same fibre. They guessed the name might borrow from those yamauba tales, and some books now call the ouni a kind of yamauba. Whether Sekien himself had that story in mind when he drew her is unknowable; he left no note saying so.
It's a useful reminder that not every yokai in the Edo-period catalogs arrived with folklore already attached. Some of them are just striking pictures that later generations worked to give a home.
See the original print
Toriyama Sekien drew Ouni in Gazu Hyakki Yagyō (1776). This book has that picture, with its caption in English.
- Japandemonium Illustrated: The Yokai Encyclopedias of Toriyama Sekien →trans. Hiroko Yoda & Matt AltThe complete Edo-period bestiaries that so many of these entries trace back to, in full English translation.
- The Book of Yokai →Michael Dylan FosterThe most readable scholarly introduction to yokai — where they come from, what they mean, and the major creatures.
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Ouni today
The ouni has stayed a minor figure — she shows up in yokai encyclopedias and art books that reproduce Sekien's Gazu Hyakki Yagyo in full, usually with a caption noting how little is actually known about her, rather than in games or anime the way her cousin yamauba does. That obscurity is arguably the most honest thing about her: a face copied from scroll to scroll, a name that's half a mystery, and a story borrowed from a different tradition entirely just so she wouldn't have to stand there meaning nothing.
