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.
A giant, straddling the mountains of Sanuki — modern Kagawa, on Shikoku.
His feet are three ri apart. About seven miles.
And he is bent over the Seto Inland Sea, using the bay that runs from Takamatsu to Marugame to wash his hands.
That's the whole picture, and it's perfect
The tearai-oni — the "hand-washing demon" — does nothing else. He isn't hunting, or building, or angry, or hungry.
He has been doing something, and now he is cleaning up.
And that is why it works.
There's a whole family of Japanese giants — the daidarabotchi class — and they are the tradition's geology department. They explain the landscape. A lake is where one sat down. A pond is a footprint. A mountain was carried there and set down because it was in the way.
Those are giants doing world-building labour, and that's what you expect a giant to be for.
The tearai-oni is doing hygiene at landscape scale.
Of everything a mountain-straddling colossus might be depicted doing, the 1841 picture-book chose washing his hands — and the enormity becomes domestic, and therefore, oddly, believable.
You cannot really imagine something seven miles across. You can absolutely imagine somebody rinsing their hands off after a job.
Kagawa keeps his relatives
There's no second attestation of the tearai-oni himself. But the prefecture has others in the same posture, which suggests the picture-book was name-branding a living local tradition rather than inventing one.
Ojomo — who straddled Iinoyama and Aonoyama to drink seawater. And whose footprints are allegedly still visible on Iinoyama's summit.
Mago-tarō — spanning two other peaks.
Same stance, same prefecture, three names.
Which means Sanuki had a standing habit of imagining something enormous standing with one foot on each of two known mountains — and the picture-book caught one instance of it and printed it.
Iinoyama is real and you can climb it
It's known locally as Sanuki Fuji, for the shape.
And it has the summit footprint.
Which is the thing that makes these giants different from most of the tradition: they leave mappable evidence. Not a shrine or a relic — terrain, identified as a body part's impression, in a place you can walk to on an afternoon.
Somebody stood on that summit, looked at a depression in the rock, and decided what had made it.
And the modern version writes itself
The bay he washes in is spanned today by the Great Seto Bridge — one of the longest bridge systems in the world, carrying road and rail between Shikoku and Honshu.
Which gives you the scale comparison, and it's worth making: the giant's stance is roughly a bridge.
An eight-hundred-year-old imagination of something that could stand across that water, and then, in 1988, an engineering project that did.
Field guide
At a glance
- Behavior
- Straddles the Sanuki mountains, feet seven miles apart, and washes his hands in the Seto Inland Sea.
- Powers
- Scale — a stance wider than the Seto Bridge.
- Weaknesses
- None recorded; he isn't bothering anyone.
- Oddities
- Kagawa keeps his relatives: one giant drank seawater between two peaks and left summit footprints still pointed out today.
- Of everything a colossus might do, the picture-book chose hygiene — domesticity at landscape scale.
Overview
A giant straddling the mountains of Sanuki — feet three ri (~7 miles) apart — bent over the Seto Inland Sea, washing his hands in "the bay extending from Takamatsu to Marugame" — Ehon Hyaku Monogatari (1841) [ehon-1841]; [ja-tearai-oni]. The JA record classes him plainly: "a type of daidarabotchi" [ja-tearai-oni]. A stance wider than the Seto Bridge, doing the most domestic thing a body can do.
The record
No second attestation of the tearai-oni himself exists — but Kagawa keeps his relatives [ja-tearai-oni]:
- Ojomo, who straddled Iinoyama and Aonoyama to drink seawater, footprints "allegedly visible on Iinoyama's summit."
- Mago-tarō, spanning two other peaks.
Same posture, same prefecture: the picture-book entry looks like one instance of a living Sanuki giant-straddler tradition, name-branded for print.
The reading
The daidarabotchi family is the tradition's geology department — giants as the explanation for lakes, footprint-ponds, mountain placement. What the tearai-oni adds is tone: not world-building labor but hygiene at landscape scale. The Ehon's genius pick — of everything a mountain-straddling giant might do, he washes his hands — makes the enormity domestic and therefore believable. For the places page: Iinoyama ("Sanuki Fuji") with its summit footprint is a mappable pin, and the Takamatsu–Marugame bay gives the site a second Seto-Inland-Sea station beside the umibōzu.
Two-track labeling
The image
Citations
The record
- [ja-tearai-oni]「手洗鬼」ja.wikipedia via WebFetch (retrieved 2026-07-26), Tier C.modern reference Japanese Wikipedia's article on this subject, as retrieved in 2026 — often carries regional detail the English article lacks.All-source record
- [ehon-1841]per 02-HISTORICAL-CATALOGS.md.Edo, 1841 Ehon Hyaku Monogatari (Takehara Shunsen) — a late-Edo illustrated 'hundred tales' book: the parlor game fossilized into print.All-source record
Where the evidence thins
Open questions
- Ojomo and Mago-tarō field sources (Kagawa gazetteers).
- Daidarabotchi entry cross-link pass (the giant family tree).