What Is Hyakki Yagyo? Japan's Night Parade of One Hundred Demons, Explained

Down the great avenue at midnight, a procession of demons and yokai shuffles past. Hyakki yagyo — the night parade of one hundred demons — is the single image that best captures how Japan imagined the uncanny. Even now, a room where everyone is doing exactly as they please gets called "a regular hyakki yagyo."

This article explains what hyakki yagyo is, where the name comes from, how it grew from Heian tales into Muromachi scrolls, and what was said to happen if you met it — purely as a matter of folklore and culture.

What hyakki yagyo is (the meaning)

Hyakki yagyo, also read hyakki yako, is the tradition of a great many demons and yokai marching in procession through the streets late at night. The "hundred" is not a number but an idiom for "countless." The phrase points at a scene: uncountable strange shapes on the move, after dark.

By extension it survives in modern Japanese as a set phrase for any chaotic scene in which a crowd behaves however it likes.

The parade in the tales — Konjaku and Uji Shui

Hyakki yagyo appears repeatedly in the tale collections of the Heian and Kamakura periods. Konjaku Monogatarishu and Uji Shui Monogatari both preserve stories of nobles and officials who blundered into the procession on a night road.

What the stories share is that meeting it does not end well. The victim dies, loses their mind, or loses part of their body. The ones who survive do so because of a charm: a Sonsho Dharani sewn into their robe by a mother, or some other protective gofu or scripture.

There was also a tradition of fixed "hyakki yagyo nights" listed in the calendar, on which one simply stayed indoors. Like the warning not to be out at omagatoki, it was a way of managing the dangers of the dark through almanac and story.

The scrolls and the tsukumogami — when tools start walking

From the Muromachi period on, hyakki yagyo flowered as a subject for painting. The scroll at Shinju-an in Daitoku-ji is the most famous, and what marches in it is not only horned demons. Biwa lutes, kotos, pots, kettles, umbrellas and straw sandals — worn-out household tools that have grown faces and limbs and are visibly enjoying themselves.

That connects straight to the idea of tsukumogami: objects that pass long years acquire a spirit, and if they are thrown out carelessly they turn yokai and come back to startle you. The procession can be read as the tools flung out at the year-end cleaning, banding together for a march.

What is striking in Japanese yokai painting is that the mood is less horror than festival. Feared, yet somehow cherished. That distance became the foundation of everything that came after in Japanese monster culture.

Why it had to be a crowd

Hyakki yagyo endured, arguably, because it was a crowd. A single onryo or akuryo has a name and a history, and can be pacified by enshrining it. The night parade has neither name nor origin. It simply arrives, in numbers.

A vague dread of the dark; an accumulation of unaccountable presences in a growing city. Things that could not be named one by one were gathered by Japanese tradition into a single phrase.

The modern night parade — naming the nameless

Plenty arrives at us unnamed too. Piled-up notifications, deadlines, one remark someone made, a general sense of not being at ease. Each is small, but arriving together at night they become exactly a procession: unmanageable.

Older generations called it hyakki yagyo, painted it, and gave it a name. Naming is also the work of shrinking a fear to a size you can handle — turning something formless into something with an outline. That remains an effective move.

Break the parade apart by writing it down

You lie down to sleep and the whole day's unpleasantness arrives at once and will not leave your head. When that happens, set the procession down on paper one figure at a time. Written out, anxieties that had blurred into each other recover their separate outlines — and you usually find there are fewer of them than it felt like.

Noroi Nikki is a private app for writing out exactly those negative feelings you cannot say to anyone, and quietly setting them down. Saved journal text is not public to other users. You choose whether to share a curse card. Before the parade swallows you, name them one by one and get them outside.

For more folklore of the night, see what tsukumogami are and what time ushimitsudoki is.