Amazake-babaa

Late at night, a knock at the door. Then an old woman's voice from outside, asking politely:

"Might you have any amazake?"

Amazake is a sweet, low-alcohol rice drink — a warm, homely thing to want, and an entirely ordinary thing for a neighbor to ask for. So you answer.

That's the mistake. Answering is the mistake. The moment you respond, the illness comes into the house — smallpox, in the era when smallpox was the terror of every family in Japan, or something milder in the gentler versions.

She's not really an old woman. She's the epidemic, standing at your door, being courteous.

The defenses

The counter-charm in Miyagi and Aomori, where the belief is strongest, was a cedar branch placed in the doorway. Something at the threshold, marking the line she can't cross.

But the best version by a wide margin comes from Yamanashi. There the local variant doesn't beg for amazake — she sells it, going door to door as a vendor. And the counter-measure people used against her was a posted sign reading, in effect: we do not like sake or amazake.

A smallpox spirit, defeated by the folk equivalent of a NO SOLICITORS notice.

She was also a protector

Here's the part that seems like a contradiction and isn't.

The same amazake-babaa was worshipped as a goddess of smallpox. Mothers made offerings to her, asking her to protect their children.

This is completely standard for Japanese disease spirits and it takes a moment to get used to. If a sickness is a visitor with a will, then the entity that brings it is also the only entity that can be persuaded not to. You don't fight her, because you can't. You host her, flatter her, make it worth her while to be gentle, and you make sure she is on good terms with your household before she ever comes down the road.

Menace and protector are the same figure, approached from two directions.

The woman who became her

And then there's the Tokyo case, which is the most interesting thing on this page.

In Kohinata there was a real amazake seller — an actual woman who really sold the drink, whose existence is a matter of record. After she died she was deified as a protector of children against disease.

That is the whole machinery of this tradition, caught working, inside recorded memory. A named human being, doing an ordinary job, becomes a supernatural figure who guards children from illness — and joins a category of spirit that already existed and was already knocking on doors in the north.

What the rule is really saying

Look at the shape of this legend alongside the others like it. Aka Manto asks a question through a door. The amazake-babaa asks for a drink. In both cases the danger enters through your reply, and in both cases the way out is to give it nothing — no answer, no engagement, no opened door.

That is quarantine, phrased as etiquette. In a world with no understanding of contagion, someone worked out that during an epidemic you do not open the door to a stranger at night, and encoded it in the one form that a frightened household will actually obey.