Visit almost any old Buddhist temple in Japan and look down at the feet of the guardian statues inside the main hall — the Four Heavenly Kings standing at the corners of the altar. Underfoot, twisted and pinned into the pedestal, is a small snarling demon taking the full weight of the guardian's sandal. That crushed figure is often labeled a generic jaki (邪鬼), but in living folklore it has a name and a personality of its own: the amanojaku, a demon whose one real power is talking people into doing exactly the opposite of what they intend.
What does it look like?
Where the kappa or the tengu have a single agreed-upon shape, the amanojaku is defined more by its posture than its face. In temple sculpture it's a compact, muscular little demon, bare-chested, scowling, caught mid-writhe beneath a guardian king's foot — punishment made permanent in wood and lacquer. In folk illustration and later retellings it's closer to a small oni: red or blue skin, sharp teeth, small horns, an expression somewhere between a smirk and a snarl. It's rarely drawn as frightening in scale. The amanojaku's danger was never its size.
Why do Buddhist guardians stand on the amanojaku?
In Buddhism, the crushed demon stands for bonnō (煩悩), the cravings and delusions that trap people. A guardian standing on it shows those desires held down.
The guardians who do this are mostly the Four Heavenly Kings (Shitennō). Their statues usually stand at the four corners of the altar platform inside a temple hall, each on a small demon called a jaki. Another guardian, Shukongōshin, is also shown trampling an amanojaku.
There is one more place to look. Bishamonten, the northern king, often wears a demon face on the belly of his armor. That face has also been called amanojaku. This is where a second spelling comes from: the armor face was written 海若 and read "amanojaku." In the Chinese classic Zhuangzi, 海若 is the name of a sea god.
A demon that reads your mind to defeat you
What makes the amanojaku distinct from a plain oni is its method. Folk tales say it reads people's hearts and teases them by copying their words. Today its name is the everyday word for someone who says "no" to everything just to be contrary. It rarely fights. It talks, and lets a person's own contrariness do the damage.
This is also why the word survived the demon. In modern Japanese, amanojaku is an ordinary noun for a person who instinctively takes the opposite stance in any conversation — agrees when everyone objects, objects when everyone agrees — with no folklore attached at all. Most Japanese speakers who use the word day to day have never thought about the demon behind it.
Uriko-hime and the impostor in her skin
The amanojaku's best-known story is Uriko-hime to Amanojaku ("The Melon Princess and the Amanojaku"), an old fairy tale collected across many regions in slightly different forms. An elderly, childless couple find a melon floating down a river or growing in their field; inside is a baby girl, Uriko-hime, whom they raise as their own. She grows into a gifted, beautiful young woman — and an amanojaku, jealous or simply drawn to mischief, lures her out of the house alone, ties her to a tree deep in the mountains, and takes her shape to sit in her place, weaving at her loom or preparing to be married off in her stead. In most tellings the impostor slips, usually caught out by an animal, a bird, or some detail it gets wrong that the real Uriko-hime never would have — and is exposed before the wedding or the theft is complete. The tale was widely reprinted in twentieth-century Japanese folktale anthologies and later animated as one of the hundreds of regional stories retold on the long-running television series Manga Nihon Mukashibanashi, which is how most contemporary Japanese children still meet the amanojaku, not through a temple statue.
How does the Uriko-hime story end?
It depends on where the story is told. Folklorists sort the versions into two main types.
In western and southwestern Japan, Uriko-hime survives. The amanojaku ties her to a tree and takes her place. A bird, often a sparrow, reveals the trick. The demon is killed, and the real princess is married after all.
In the Tōhoku and Hokuriku regions of the north, the ending is darker. The amanojaku kills Uriko-hime, and a small bird tells people what happened.
Many versions add one more detail. They explain why the stems or roots of buckwheat, millet or miscanthus grass are red. That red, the tale says, is blood, from the princess or from the punished demon. The oldest written version is a picture scroll from the early Edo period, Uriko-hime Monogatari.
Is the amanojaku the echo in the mountains?
In some parts of Japan, yes. People there call echoes and tree spirits "amanojaku." This was recorded in Akita, Ibaraki, Gunma and Shizuoka. The demon copies your voice, so the mountain shouts your words back. (See also yamabiko and kodama.)
In other places, the name belongs to someone else. In parts of Tochigi, Toyama and Gifu, the mountain hag yamauba is called amanojaku.
Around Hakone and Izu, the amanojaku is a giant. One story says it tried to tear down Mount Fuji and failed. The soil it dropped became the island of Izu Ōshima. In Kume District, Okayama, it piled up stones to make a mountain taller, but dawn came before it finished. In these areas, loose boulders on peaks and old stone walls of unknown origin are blamed on the amanojaku.
Where it comes from
Folklorists generally trace the name back to Amanosagume, a minor deity named in the eighth-century chronicle Nihon Shoki. In that episode, the god Ame-no-Wakahiko is sent down from heaven and does not return. Heaven sends a pheasant to ask why. Amanosagume tells him the bird is a bad omen, and he shoots it dead. One common theory says her name later merged with ja (邪), "wicked" or "crooked," and with Buddhist demon iconography imported from the continent, producing both the household word for a contrarian and the specific little demon sculpted underfoot at temple gates — Buddhist art's way of showing that the guardian kings keep base impulse and stubborn wickedness permanently pinned down.
Go deeper
Books worth owning if this world pulls you in.
- The Book of Yokai →Michael Dylan FosterThe most readable scholarly introduction to yokai — where they come from, what they mean, and the major creatures.
- Japandemonium Illustrated: The Yokai Encyclopedias of Toriyama Sekien →trans. Hiroko Yoda & Matt AltThe complete Edo-period bestiaries that so many of these entries trace back to, in full English translation.
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Amanojaku today
Outside the temple gate, the amanojaku has had one of the stranger afterlives of any yokai on this site: it survives less as a monster than as a personality type. Ask a Japanese speaker to describe someone who can't help arguing the other side, and amanojaku is very often the word that comes out, unprompted. The demon also shows up by name as a recruitable, catalogued entry in Atlus's long-running Shin Megami Tensei role-playing game series, alongside hundreds of other mythological figures the franchise draws on rather than invents. But its most public appearance needs no looking up. It is the small figure stepped on at the guardians' feet, in temples most visitors walk past without ever learning its name.
