The book, plainly
Where the oldest versions live
A retelling, not a citation. What follows is the story as the most widely circulated popular accounts tell it — folklore encyclopedias, translations, and the versions that have travelled furthest. It is synthesized rather than keyed line by line to the dated primary texts, and popular versions drift from what those texts actually say. The cited, source-by-source record begins further down this page, and where the two disagree, the record wins.
When you want to know how a Japanese monster story was told first, this is usually where you end up.
The Konjaku Monogatarishū — "Anthology of Tales from the Past" — is an anonymous collection of over a thousand stories, compiled in the early twelfth century. Thirty-one volumes, of which twenty-eight survive.
Every single tale opens with the same three words: *ima wa mukashi* — "now, long ago."
That formula gave the book its name, and it gave Japanese storytelling its equivalent of once upon a time.
It's organised as a journey
The structure tells you what the compiler thought he was doing. The volumes run India, then China, then Japan — the eastward transmission of Buddhism, followed tale by tale across a continent.
Which makes the whole thing a map of how stories actually travelled, assembled by somebody who was watching it happen.
Why it matters here
An extraordinary number of the entries in this collection have their oldest telling in this book.
The fox tale-stock. The tengu carrying off monks and dropping them on distant mountaintops. The warrior who took the ghost-mother's baby at the river crossing on a dare. Kiyohime's original, before she had a name. The young man who survived the night parade of a hundred demons because his nurse had sewn a sutra into his clothes. The ox-headed and horse-faced escorts of hell. Abe no Seimei's demonstrations.
And the description of its contents is telling: oni and tengu appear alongside human characters from every social class.
That's the thing. Konjaku is where the monsters are among people — in market streets, on post-roads, in the houses of the poor as well as the great — centuries before the Edo catalogs. The street-level realism that makes Japanese folklore feel so specific starts here.
Notably, it excludes myth and Shinto almost entirely. This is not a book about gods. It's a book about what happened to somebody.
The warehouse has holes
Three volumes are missing, and scattered tales within others.
Nobody knows who wrote it. There are several theories — a court noble, a monk-compiler, a committee — and none has settled.
The Suzuka Manuscript was designated a National Treasure in 1996, and it is digitized and readable online at Kyoto University.
Which is worth sitting with. The single richest source of Japanese supernatural narrative, a thousand years old, with a National Treasure manuscript — and you can open it on a laptop.
And it fed the twentieth century
One last thread, because it goes further than folklore.
Akutagawa Ryūnosuke mined this book. In a Grove and Rashōmon — his two most famous stories — both come out of it.
Kurosawa then made the film Rashōmon from them, which won at Venice, and which is broadly credited with opening Japanese cinema to the world.
So the modern Japanese short story and international art cinema are both drawing, at one remove, from the same twelfth-century shelf that supplies the monsters.
Now, long ago — and then everything after.
Field guide
At a glance
- Behavior
- Source anchor — the thousand-tale warehouse of the early 12th century, organized as Buddhism's eastward journey: India, China, Japan.
- Oddities
- Every tale opens ima wa mukashi — "now, long ago" — the formula that gave Japanese storytelling its once-upon-a-time.
- This is where the yokai appear among people — market streets and post-roads, centuries before Edo; the street-level realism starts here.
- The National Treasure manuscript is digitized and readable online; Akutagawa mined it for the story that became Kurosawa's Rashōmon.
Overview
Where the tradition goes when it needs a tale's oldest telling: the *Konjaku Monogatarishū — "over one thousand tales," early 12th century, anonymous, 28 of 31 volumes surviving — organized as Buddhism's eastward journey: India, China, Japan [wikipedia-konjaku]. Every tale opens ima wa mukashi* — "now, long ago" — the formula that gave the book its name and Japanese storytelling its once-upon-a-time.
The tradition's account with it
This bestiary's citations to Konjaku already include: the fox tale-stock, the tengu abductions, the ubume dare, Kiyohime's original, the night-parade survivals, the hell-escorts, and Seimei's demonstrations — "particularly featuring oni and tengu alongside human characters from various social classes" [wikipedia-konjaku], and notably excluding myth and Shinto: Konjaku is where the yokai appear among people, in market streets and post-roads, centuries before Edo. The tradition's street-level realism starts here.
The object and the afterlife
Anonymous (Takakuni? a monk-compiler? — "several theories" [wikipedia-konjaku]); three volumes and scattered tales missing — the warehouse has holes, and scholarship maps them. The Suzuka Manuscript (National Treasure, 1996) is digitized at Kyoto University [wikipedia-konjaku] — the tradition's richest source is readable online today. Akutagawa mined it (In a Grove → Kurosawa's Rashōmon [wikipedia-konjaku]) — the modern short story and world cinema both drawing from the same shelf this bestiary does.
Two-track labeling
The image
Citations
The record
- [wikipedia-konjaku]"Konjaku Monogatarishū," Wikipedia (retrieved 2026-07-26), Tier C.modern reference English Wikipedia's article on this subject, as retrieved in 2026 — an aggregate starting point, not a primary source.All-source record
Where the evidence thins
Open questions
- The Kyoto University digitization (link and use — the standing Konjaku tale-number threads across a dozen entries can be closed against it).
- Uji Shūi anchor completes the setsuwa trilogy (next).
- The ima-wa-mukashi formula note for the site's entry-template (editorial charm).