The tale, retold
The month a boy was haunted
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.
Miyoshi, in Hiroshima, 1749.
A sixteen-year-old samurai named Inō Heitarō and his friend Gonpachi went up Mount Hikuma and played the hundred-tales game — a hundred ghost stories, a hundred candles put out one by one — all the way to the end.
Everybody knows you stop at ninety-nine. That's the whole convention. Finishing is a dare.
They finished.
Thirty days
And the dare was accepted.
For thirty consecutive days and nights, Heitarō's house filled with yokai. A different apparition or phenomenon every single day, escalating.
Things came through the walls. Enormous faces filled rooms. Objects moved and multiplied. Hands came out of places hands do not come out of. The house was overrun on a schedule, day after day, for a month, and the accounts run through it one day at a time.
And what makes this the most extraordinary haunting on record is what the boy did about it.
He put up with it
No exorcism. No priest, no diviner, no talisman, no fleeing to a relative's house in the next province.
A sixteen-year-old treated a month-long supernatural siege with unimpressed patience. He went about his business. He slept in the house. He watched things arrive, and he did not flinch, and he did not leave, and in the morning he did it again.
That's the entire defence, and it worked.
The tradition's capstone — and I should flag that this famous ending needs firmer sourcing than the popular retellings give it — is that on the final night the commander of the yokai, a figure named Sanmoto Gorōzaemon, appeared in person to commend the boy's courage and withdraw the entire company.
The night parade came to his house for a month and left because he was unmoved.
It has a paper trail
The Inō Mononoke Roku isn't one book. It's a body of scrolls, illustrated accounts, and copies made and recopied since the eighteenth century — a day-by-day record of a haunting, effectively serialized, with pictures.
That makes it the longest continuously documented single supernatural event in the tradition. Not a legend recalled generations later: an account structured by calendar, with a day count, copied by people who wanted the sequence right.
And the town leaned in. Miyoshi opened the Miyoshi Mononoke Museum in 2019 — Japan's first museum dedicated to yokai — built around this story. The case has its own building in the place it happened.
Why this one matters more than it looks
Read across this whole collection and a rule keeps surfacing. Don't answer the question. Don't laugh back. Don't smile at her. Don't kick the thing that grows when kicked. Grip your own thumb. Lie flat and let it pass. Say after you and stand aside.
Composure is the tradition's most consistently rewarded virtue — more than courage, far more than force.
Heitarō is that rule at maximum scale. Thirty days of it, in his own house, at sixteen.
And notice what his yokai do not do: they never quite kill him. They are overwhelming and relentless and entirely non-lethal — the haunting as an endurance test rather than an execution.
The modern Japanese habit of treating monsters as something to be lived alongside rather than destroyed owes this scroll a real debt. Mizuki adapted it devotedly, and it shows.
A boy played the game that generated the literature; the literature's entire cast turned up at his house; and he beat them by being harder to impress than they were.
Field guide
At a glance
- Behavior
- The great documented haunting: in 1749, sixteen-year-old Inō Heitarō played the hundred-tales game to its forbidden end — and for thirty days and nights, a different apparition filled his house daily.
- Powers
- The whole cast of the tradition, serialized — escalating, overwhelming, and never quite lethal.
- Weaknesses
- Composure: the boy endured with unimpressed patience, and in the famous (verification-flagged) ending the yokai commander appeared on the final night to commend his courage and withdraw the company.
- Oddities
- A serialized haunting with a paper trail — day-by-day illustrated scrolls copied since the 18th century.
- Miyoshi opened Japan's first yokai museum around this one story: the case's own shrine.
Overview
Miyoshi, Hiroshima, 1749. A sixteen-year-old samurai, Inō Heitarō, and his friend Gonpachi climbed Mt. Hikuma and played the hundred-tales game to its forbidden end — a hundred stories, a hundred candles out, the dark dared [search-2026-07-25]. Then the dare was accepted: for thirty days and nights, Heitarō's house filled with yokai — a different apparition or phenomenon each day, escalating — and the boy's response became the story: he endured. Not exorcism, not flight — a teenager treating a month-long haunting with unimpressed patience. The tradition's ending (the yokai commander Sanmoto Gorōzaemon appearing on the final night to commend his courage and withdraw the whole company — flag: this famous capstone needs source-verification beyond our aggregate) crowns it: the parade defeated by being sat through.
The record
- The Inō Mononoke Roku — "a collection of scrolls, books, and legends which collectively form the narrative" [search-2026-07-25] — day-by-day illustrated accounts copied and recopied since the 18th century: effectively a serialized haunting with a paper trail, the tradition's longest single documented supernatural event.
- The living anchor: Miyoshi opened the Miyoshi Mononoke Museum (2019) — Japan's first yokai museum — around this story and the Yumoto Kōichi collection [verify holdings]; the town is the case's own shrine.
- Mizuki adapted it devotedly; the modern yokai canon's gentleness-to-monsters owes this scroll a debt: its yokai are overwhelming but never quite lethal — the haunting as endurance-test, not execution.
The reading
The tradition's structural finale: a boy plays the game that generates the literature, the literature's whole cast shows up, and the human wins by the only means the tradition finally respects — composure. Every rule on the Rules page compresses into Heitarō's month: don't flinch, don't flee, don't look away. The site's hundred-tales mode has its patron saint.
Two-track labeling
The image
Citations
The record
- [search-2026-07-25]aggregate (the Kappapedia summary et al.); the scroll corpus and Miyoshi Mononoke Museum are the deep-pass anchors; Sanmoto ending flagged pending verification.research note A dated research-session note from this bestiary's own working files.All-source record
Where the evidence thins
Open questions
- The Sanmoto Gorōzaemon finale's textual basis.
- Miyoshi Mononoke Museum / Yumoto collection documentation.
- The thirty-days site feature (editorial gold).