The picture, plainly
What Sekien drew
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.
A beautiful woman, seen from behind, standing by water.
And in the water at her feet, the reflection shows an old man's face.
That's it. That's the whole plate, from 1784, and the name is the punchline: iya ya — roughly "oh no" — the exact noise you'd make at the moment you worked it out.
A creature named after a reaction
Sekien's caption explains the naming, and in doing so exposes his method more plainly than almost anywhere else.
He cites a Chinese precedent. The Han official Dongfang Shuo once encountered a strange creature and named it kai-sai — "how strange!" And Sekien says his yokai follows that example, hence its own name.
So: a monster named after an exclamation, justified by pointing to another monster named after an exclamation.
That's the workshop with the door open. He isn't recording a belief; he's constructing a creature out of a naming convention, and telling you which convention.
The detail that makes it good
But look again at what he actually drew, because there's a real idea in the composition.
The wrong face appears in the reflection — before she turns.
The whole genre this belongs to runs on the turn. A woman on a dark road, you call out, she looks back, and there's nothing there — no eyes, no nose, no mouth. The horror is timed to the pivot.
Sekien spoils the timing on purpose. The water has already told you. The evidence is sitting there at her feet, visible, in advance, and the person in the picture is going to speak to her anyway.
The tradition does this more than you'd expect. The sailors who walk ten kilometres across an island noting that the vegetation is wrong and there's seaweed in the treetops, and land on it anyway. The samurai who's been shown a skeleton in his own bed and takes the talisman down himself.
The evidence is always already there. The horror is that you check too late.
The later accretion
The modern version has drifted, as they do.
Later hands renamed it iyami — roughly "strange-old-man flavour" — and the twentieth century standardized the job description: a beautiful back, a wrinkled and hideous elderly face, startling people who call out to the pretty stranger.
The reflection, which is the best thing about the original, mostly got dropped along the way. Murakami's verdict is that the creature is Sekien's invention, though later versions may have absorbed some genuine folk material on the way through.
If it's ever illustrated fresh, the rule writes itself: never show the turned face. The water carries the entire plate.
Field guide
At a glance
- Behavior
- A beautiful woman seen from behind — and in the water at her feet, the reflection shows an old man's face.
- Powers
- The reveal; the name is the reaction — "iya ya," roughly "oh no."
- Weaknesses
- None recorded; it's a punchline with a robe.
- Oddities
- Sekien's caption cites a Chinese creature named "how strange!" as precedent — a yokai named after an exclamation, on the authority of another yokai named after an exclamation.
- The wrong face appears in the reflection before any turn: the evidence is always already there; the horror is that you check too late.
Overview
A beautiful woman seen from behind — and in the water at her feet, the reflection shows an old man's face — Sekien, Konjaku Hyakki Shūi (1784) [sekien-1784]; [ja-iyaya]. The name is the punchline: iya ya — roughly "oh no / no way" — the exact syllables you'd emit at the reveal.
The record
- Sekien's caption cites a Chinese precedent: the Han official Dongfang Shuo once named a strange creature kai-sai (怪哉, "how strange!") — "this yokai follows that example, hence 否哉" [ja-iyaya]. A yokai named after an exclamation, on the authority of another yokai named after an exclamation: Sekien showing his method at its barest.
- The accretion: later hands renamed it iyami (異爺味 — "strange-old-man flavor"); Mizuki and Tada standardized the modern job description — beautiful back, "wrinkled, hideous elderly face," startling those who call out to the pretty stranger [ja-iyaya].
- Murakami's verdict: original invention, though later versions may have absorbed genuine folk material [ja-iyaya].
The reading
The gaze file's grammar lesson. The whole mikaeri (looking back) genre — nopperabō included — runs on one wager: the face you're owed versus the face you get. Iyaya is that wager distilled to a name that is the reaction. Note what Sekien actually drew, though: the wrong face appears in the reflection, before any turn — the water spoils the surprise the way the botany spoiled the akaei's island. The tradition keeps insisting: the evidence is always already there; the horror is that you check too late.
Two-track labeling
The image
Citations
The record
- [ja-iyaya]「否哉」ja.wikipedia via WebFetch (retrieved 2026-07-26), Tier C carrying Murakami, Mizuki, Tada.modern reference Japanese Wikipedia's article on this subject, as retrieved in 2026 — often carries regional detail the English article lacks.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
- Dongfang Shuo's kai-sai anecdote source (for the China-import table).
- The iyami rename chain (which collection introduced it).