Nihon Ryōiki

If Japanese monster-telling has a birth certificate, this is it.

The *Nihon Ryōiki — full title Nihonkoku Genpō Zen'aku Ryōiki, "Record of Miraculous Events in Japan" — was composed between 787 and 824 by Kyōkai*, a monk at Yakushi-ji.

116 tales, in three volumes. It is the oldest collection of Buddhist setsuwa — didactic tales — in Japan.

And inside it are the first written versions of things you have already met.

What's in there

The fox-wife of Mino. A man marries a beautiful woman; she bears him a child; the household dog frightens her one day and she reverts to a fox and flees. He calls after her — come back and sleep with me — and she does, every night, which is the origin story the tradition gives for the word kitsune itself.

That is the first document of the supernatural-spouse genre in Japan. Every crane wife, every snake bride, every fox lover in a thousand years of Japanese storytelling descends from this page.

The Gagoze of Gangō-ji. A demon prowling a temple by night, killing the boys who keep the bell tower — until a servant of unusual strength waits for it in the dark, grabs it by the hair, and holds on. The demon tears free and escapes, leaving its scalp behind, and the temple keeps it.

The first told oni-slaying. Everything from Shuten-dōji to the demon at the Rashōmon gate is downstream of that night.

But the frame matters more than the contents

Here's why this is worth an entry of its own rather than a line in a bibliography.

Kyōkai wasn't collecting monsters. He was proving a point.

Every one of his 116 tales exists to demonstrate karma — that deeds return, reliably, in this life or the next, with the arithmetic visible. The strange things in the book are evidence in an argument about consequence.

And that engine never stopped running.

Look at what the tradition kept producing for the next twelve hundred years. The wronged wife who comes back as a face in a lantern. The starving roadside spirits who make travellers collapse from hunger, because they died hungry themselves. The temple abbot whose resentment turns him into a rat. The fire-cart that comes for the wicked at their own funerals.

Those aren't random creatures. They are all the same idea, wearing different skins: a thing that happened, coming back with a body on.

From its very first book, this tradition's monsters are consequences with bodies. Kyōkai set that up, and nobody has needed to change it since.

And he cited his sources

One more thing, and I think it's underrated.

Kyōkai names places. He gives provinces, districts, temples, and the reign during which the event occurred.

The setsuwa genre was born citing.

Which means the habit that runs through the entire later tradition — the catalogues that name their sources, the scholars who date every plate, the regional collectors who record which village told them what — didn't have to be invented in the modern period. It was in the founding document.

The monsters and the footnotes arrived together, in the same book, in the eighth century.

The object itself has a story

Five incomplete manuscripts survive. Two of them are National Treasures — one at Kōfuku-ji dated 904, one from Raigō-in, late Heian.

And the Raigō-in manuscript was found in 1973.

Which is the part that stops me. The founding book of the Japanese supernatural tradition — twelve hundred years old, the source of the first fox-wife and the first demon-fight — was only made whole again about fifty years ago.

There are people alive who were adults when the text was still incomplete.

There's a linguistic bonus too. The book is written in man'yōgana — Chinese characters used phonetically — and its spellings preserve vowel distinctions that Japanese has since lost.

So the monsters' first book is also a fossil of the language that told them. You can hear, in the spelling, sounds nobody has made in a thousand years.