Folklore, retold
The story as it is told
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.
The nekomata is the older and darker of Japan's two great cat monsters, and it enters the record in an unusual way.
Not as a legend. As news.
1233, in a courtier's diary
Fujiwara no Teika — one of the most important poets in Japanese history, the man who compiled the Hyakunin Isshu — kept a diary called the Meigetsuki.
And in 1233 he wrote down that a nekomata near Nara had killed and eaten several people in one night.
That's not a ghost story. That's a note about a current event, in the journal of a very serious man, filed alongside court appointments and the weather.
A hundred years later, Yoshida Kenkō put it in the Tsurezuregusa — the Essays in Idleness, one of the great works of Japanese prose:
> In the mountain recesses, there are those called nekomata, and people say that > they eat humans.
Two of the most respected writers of the medieval period, reporting a man-eating cat in the hills as a thing that was going around.
Then Edo brought it indoors
The original nekomata is a wild thing — a mountain predator, and in Edo accounts it had grown to the size of a dog or a boar.
But at some point the fear moved house.
The Edo version says this: a cat kept too many years becomes one.
Not a different species. Yours. The one on the mat. Give it long enough and its tail splits in two, and it stands up.
There were illustrated guides — the picture-books of the 1730s and 1770s — that showed the transformation by age. Here is a cat at ten years. Here it is at twenty. Here is what it is by then.
And the practical consequence was a real and widespread belief that you should not keep a cat long-term. Not out of cruelty. Out of a sense that there was a term limit, and that going past it was asking for something.
What it can do once it turns
Walk upright. Speak. Take human form — and it's almost always an old woman.
Conjure strange fires.
And then the signature ability, which nothing else in the tradition has quite like this:
It commands the dead to dance.
The accounts describe it gesturing — with paw and with tail, in a ritual pattern — and corpses getting up and moving to it.
A cat, standing on its back legs in a graveyard, conducting.
This isn't unique to the nekomata; the corpse-stealing cat-demon that appears at funerals to carry off the wicked shares the territory. Japanese folklore had a settled conviction that cats and the dead have an arrangement, and that a cat should be kept out of the room where a body lies.
Two explanations for where it came from
One is scholarly. Chinese tales of the xiānlí — leopard cats that acquire powers with age — and the general Chinese principle that any animal, given enough years, accumulates something.
The other is domestic, and I find it more interesting.
Edo Japan had a practical custom of docking cats' tails.
There's a reading that runs the fear backwards. If tails get cut short as a matter of routine, then a cat with a long, full, forked-looking tail is a cat that got away with something — one that was never handled, never managed, never brought into the household's arrangements.
The monster isn't the cat. It's the unsupervised cat.
That, incidentally, is exactly the shape of the belief about age. The danger isn't feline. It's duration. A cat that has been in your house long enough to have watched everything, learned the routine, and outlived its usefulness as a mouser.
The picture that everyone remembers, from the 1737 scroll, gets this exactly right: the nekomata as a woman-cat playing the shamisen.
Not attacking anyone. Sitting up, dressed, performing — doing a person's accomplishment, in a person's posture, having spent a great many years in a person's house watching how it's done.
Field guide
At a glance
- Behavior
- The cat kept too long: tail splitting in two, it walks upright, speaks, assumes an old woman's form — and commands corpses to dance.
- Powers
- Necromancy with paw and tail; strange fires; the mountain type grew to boar-size and ate people.
- Weaknesses
- None recorded — hence the widespread Edo belief that cats shouldn't be kept long-term, and possibly the custom of docking their tails.
- Oddities
- It enters history as news: a courtier's 1233 diary records one killing several people in a night near Nara.
- Kenkō's Tsurezuregusa carries the genuine medieval warning — the same book that later seeded Sekien's inventions: one source, both ends of the spectrum.
Overview
The nekomata is the older and darker of Japan's two great cat yokai: first recorded not as superstition but as news — a beast killing people near Nara in 1233 — and later as the fate awaiting any house cat kept too long, its tail splitting in two as it learns to walk upright, speak, and dance with the dead.
Earliest attestations
- Meigetsuki, the diary of poet Fujiwara no Teika: in 1233, a nekomata (猫胯) "killed and eaten several people in one night" in the Nanto region — the creature enters history in a courtier's diary [wikipedia-nekomata].
- Tsurezuregusa (Yoshida Kenkō, c. 1330s): "In the mountain recesses, there are those called nekomata, and people say that they eat humans" [wikipedia-nekomata].
- Hyakkai Zukan (1737) paints the nekomata as a shamisen-playing woman-cat; Sekien catalogs Nekomata in his first volume [hyakkai-zukan-1737]; [sekien-1776].
The two kinds
- Mountain nekomata — the Kamakura-era original: a wild man-eater of the hills, in Edo accounts grown to the size of dogs or boars [wikipedia-nekomata].
- The transformed house cat — the Edo domestication of the fear: cats kept too many years grow a forked tail and become nekomata; hence the widespread belief that cats shouldn't be kept long-term, and illustrated guides (1737–1776) showing the transformation by age [wikipedia-nekomata].
Powers
Walking upright; human speech; assuming human form (typically an old woman); strange fires; and the signature — necromancy: commanding corpses to dance "with ritualistic dances, gesturing with paw and tail" [wikipedia-nekomata]. The corpse-affinity overlaps with the kasha, the corpse-stealing cat-demon of funerals, itself painted in both founding catalogs [hyakkai-zukan-1737]; [sekien-1776].
Origins
Scholarly parallel: Chinese xiānlí tales of leopard cats gaining power with age [wikipedia-nekomata]. The tail-splitting may fold in the practical Edo custom of docking cats' tails — the fear, read backwards, as a grooming policy.
Two-track labeling
The image


Citations
The record
- [wikipedia-nekomata]"Nekomata," Wikipedia (retrieved 2026-07-23), Tier C; backbone Meigetsuki + Tsurezuregusa — primary passage verification pending.modern reference English Wikipedia's article on this subject, as retrieved in 2026 — an aggregate starting point, not a primary source.All-source record
- [hyakkai-zukan-1737]per 02-HISTORICAL-CATALOGS.md.Edo, 1737 The Hyakkai Zukan, Sawaki Sūshi's painted scroll of a hundred spirits — the picture-catalog tradition Sekien built on.All-source record
- [sekien-1776]per 02-HISTORICAL-CATALOGS.md.Edo, 1776 Toriyama Sekien's Gazu Hyakki Yagyō — the first of his four illustrated yokai catalogs, the books that made the night parade a printed genre.All-source record
- [sekien-1784]per 02-HISTORICAL-CATALOGS.md.Edo, 1784 Sekien's fourth and final catalog (Gazu Hyakki Tsurezure Bukuro) — the tsukumogami volume: household objects come alive.All-source record
Where the evidence thins
Open questions
- Meigetsuki 1233 entry: exact date/wording.
- Tsurezuregusa: which essay number (89?) — verify.
- Kaibyō cluster page: nekomata + bakeneko + kasha + gotokuneko [sekien-1784].
- Tail-docking custom as origin of the fork.