Kijo

Kijo means "demon women" — and it's a category, not a creature: women who became oni through resentment and karma.

They're graded by age. The young ones are kijo. The old ones are onibaba, "demon hags."

And the class has one structural fact that decides everything about it.

Male demons are born. Female demons are made.

Japan's male oni are, overwhelmingly, just demons — that's what they are, it's their species, they were never anything else. The demon king on Mount Ōe was always a demon king.

The kijo are almost always made, and the record says by what:

Jealousy. The Bridge Princess prayed at a shrine for seven days to be turned into a living demon, then stood in a river for twenty-one nights with an iron crown of burning candles on her head. And it worked.

Betrayal. Kiyohime, lied to by a monk who promised to come back, became a serpent halfway across a flooded river while chasing him.

Atrocity and grief. The hag of Kurozuka, in a lonely house, with a room nobody is allowed to open.

And sometimes nothing at all. Suzuka Gozen, who may simply have chosen it.

That asymmetry is the whole meaning of the class. Nobody asks how the male oni got that way, because the question doesn't arise. Every single kijo comes with a cause, and the cause is almost always something that was done to her.

The face

The class has a face, and it's carved: the hannya mask of the Noh stage.

Horns, metal eyes, a mouth full of teeth. And the thing it does — level, it reads as rage; tilted slightly down, it reads as weeping — is the class's doctrine machined into wood.

Noh even carves the stages of the transformation as separate masks: an ordinary woman's face with gold-dusted eyes, then horns just breaking the skin, then the full demoness, then the serpent forms.

You can buy the process in instalments. That's the tradition telling you, in a mask-carver's catalogue, that this is a road rather than a nature.

Who actually behaved worst

The word survived into everyday Japanese as an insult — kijo, used of a woman with a hideous heart.

Which is worth setting against the founding stories, because in nearly every one of them, the woman is not the person who behaved worst.

A monk who lied and ran. A husband who took a second wife. A household that starved a child. A man who married a woman for her money and killed her with a sickle by a river.

The demon arrives afterwards.

And the plays — this is the striking part — keep taking her side. The stage versions of these stories are consistently more sympathetic than the medieval Buddhist originals, which were largely warnings to monks about the danger women posed to their discipline. Somewhere between the temple and the theatre, the sympathy moved.

The one-line thesis for the whole class is this: the kijo is what the tradition says happens to a woman's anger when it has nowhere lawful to go.

Give it a legitimate channel and you get a complaint. Deny it one for long enough and the tradition says you get horns.