Ichimoku-nyūdō (also Hitotsume-nyūdō, Kamokoshin)

Region/Culture: East Asia
Mythos: Japanese Mythology
Primary Type/Nature: Gods and Deities
Mythical Attributes: A one-eyed water god who draws the fish of Lake Kamo onto a magic lapis lazuli hook and is invincible in the water but helpless on dry land.
Role in Mythos: The guardian deity of Lake Kamo on Sado Island, a visiting god who comes to the surrounding villages each New Year.
Relation to Humans: He deals generously with those who keep faith with him, supplying fresh fish by his enchanted hook. Cross him and he returns every year to wreck the offender’s house, held off only by all-night prayer.

Every morning for years, a man walked down to a willow at the edge of Lake Kamo and found a fish waiting for him, hung from a low branch by a hook of polished lapis lazuli. It was always fresh, always large, and it was never there by any hand he could see. The water of the lake lay flat and cold behind it. Somewhere under that surface lived the thing that left it, and the arrangement between them was simple enough that it took only a small act of greed to break it.

The thing was Ichimoku-nyūdō, the one-eyed priest of Sado Island. He is the guardian of Lake Kamo, the largest lake on that island off the coast of Niigata, and the oldest way of describing him is also the plainest. He is a water god. Not a demon, not a ghost, but a god who lives in a lake and keeps it. Across Sado the stories about him run in slightly different channels, and his name shifts with them. In some places he is Kamokoshin, the god of Lake Kamo. In others he is Hitotsume-nyūdō, which means exactly what his more common name means, the one-eyed priest.

What he looks like depends on how late the telling is. The detail that survives everywhere is the eye, a single large one set not in the middle of a face but on the top of his head, watching upward out of the water. Later storytellers reached for a shape they already had and made him kappa-like, lending him the greenish, child-sized, river-dwelling body of Japan’s most famous water yokai. The old accounts do not go that far. They call him a god of the water and leave the rest of him submerged, which may be the more honest picture. A god of a lake does not need a face anyone can draw.

He keeps a calendar. Ichimoku-nyūdō comes around every year near the New Year, and that timing places him in older company than the yokai catalogues suggest. The visiting gods of Japan, the raihōjin, arrive from somewhere beyond the village at the turn of the year to be fed and feared and sent off again. The namahage of the Oga Peninsula, straw-caped and bellowing at frightened children, are the same sort of guest. Whatever else he became, the one-eyed god of Lake Kamo seems to have started as one of these seasonal callers, the kind you set a place for whether you want to or not.

His temper shows itself in the tale that made him famous, and it opens close to comedy. Curious about the dry land around his lake, Ichimoku-nyūdō climbed out one day and went wandering. He found a horse tied to a tree in a small stand of woods and was delighted by it. He hauled himself onto its back and rode it in circles, laughing and crying out in joy, entirely pleased with himself, until the horse’s owner came back and caught him at it.

On land he was nothing. In the water no one could touch him, but here, dripping and cornered, the god could only throw himself down and beg. He made an offer to buy his freedom. Let me go, he said, and I will bring you a fresh fish every day, strung under the willow by the lake on my own magic hook. Only throw the hook back into the water each morning, so I can use it again. The man agreed and released him, and the next morning the first fish hung there, blue-hooked, from the branch.

For years the trade held. Then one morning the man decided the hook was worth more than the fish and kept it for himself. The fish stopped coming. On the fifteenth day after the New Year, Ichimoku-nyūdō came instead, and he tore through the man’s house in the dark, breaking whatever he could reach. The man prayed to the Buddha the whole night, and by dawn the assault had ended. It seemed his prayers had worked. But it was not finished. The god returned on the same day the next year, and the year after that.

Desperate, the man gave the lapis lazuli hook to a nearby temple of Kannon, the bodhisattva of compassion, hoping the god would chase it there and leave him in peace. The god chased it there. The next year Ichimoku-nyūdō came against the temple itself with an army of lesser water-things at his back, and the priests spent the night in prayer while something hammered at the walls. By morning they had been spared. They have not stopped preparing since. On the fifteenth day after every New Year, the priests at that temple still keep an all-night vigil against his coming.

Not every version lets everyone live. In one, the horse owner sells the hook to a merchant for a great sum, and Ichimoku-nyūdō answers by slaughtering the man’s entire family, after which the terrified villagers raise the temple to Kannon themselves. The lesson underneath the branching versions is the same, and it is not a gentle one. He kept his word exactly as long as the man kept his.

His powers are those of the element he owns. In the water he is untouchable, master of the lake and everything that swims in it, able to call a fish onto a hook or a horde of underlings to a wall. He can cross onto land, and once a year he does, arriving with the certainty of a season. The hook is his, an instrument that pulls fresh fish from the lake at will. Against all of this stands one flat limitation, the one the whole story turns on. Out of the water he is powerless. The god who cannot be caught in his own lake can be pinned by a single irritated farmer the moment his feet touch dry ground. Prayer holds him off, temple by temple and night by night, but it does not defeat him, and the mercy of Kannon only turns his anger aside rather than ending it. He does not forget a broken bargain, and he shows no sign of tiring of the walk back to collect on one.

Frequently Asked Questions

Who is Ichimoku-nyūdō?

Ichimoku-nyūdō is a one-eyed water god of Japanese folklore who guards Lake Kamo, the largest lake on Sado Island in Niigata Prefecture. His name means “one-eyed priest,” and the oldest accounts describe him simply as a water god with a single large eye on the top of his head. He is also known as Kamokoshin, “the god of Lake Kamo,” and as Hitotsume-nyūdō.

Is Ichimoku-nyūdō a kappa?

Not originally. Later tellings describe Ichimoku-nyūdō as kappa-like, giving him the appearance of Japan’s well-known water yokai, but no early source calls him a kappa. The earliest accounts identify him only as the water god of Lake Kamo, distinguished by the single eye on top of his head.

What is the legend of Ichimoku-nyūdō’s magic hook?

After being caught riding a farmer’s horse on land, where he was powerless, Ichimoku-nyūdō promised to leave a fresh fish each day under a willow by Lake Kamo, strung on a magic lapis lazuli hook, so long as the hook was returned to the water each morning. When the farmer eventually kept the hook, the god retaliated by attacking his house every year on the fifteenth day after the New Year.

Why do temple priests hold a vigil against Ichimoku-nyūdō?

When the stolen lapis lazuli hook was donated to a temple of Kannon, Ichimoku-nyūdō attacked the temple with an army of lesser water spirits, and only a night of prayer spared the priests. Since then, the priests hold an all-night vigil every year on the fifteenth day after the New Year to ward off his return.

What is Ichimoku-nyūdō’s weakness?

Ichimoku-nyūdō is invincible in the water but completely powerless on dry land, where even an ordinary person can capture him. Prayer, especially to the bodhisattva Kannon, can hold off his yearly attacks, though it redirects his anger rather than destroying him.