Japanese Mythology

Ningyo

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Tradition / Region: Japanese Mythology
Alternate Names: Mermaid, human-fish
Category: Mermaid

The Myth

In ancient times, strange beings were said to appear in the waters of Japan—creatures neither fully human nor fully fish.

The Nihon Shoki tells that in the year 619, during the reign of Empress Suiko, a human-like creature appeared in the Gamo River in Ōmi Province. In another account, a fisherman from Settsu caught something in his net that was neither fish nor human. These were said to be ningyo.

In Ise Province, a fisherman once drew up a fish with a human head. When people approached it, the creature cried and made sounds like a person. Those who cut and ate its flesh found it delicious, and no harm came to them.

Ningyo were sometimes washed ashore or caught in nets. Because they were rare, they were offered as gifts to powerful lords. One caught in Bungo Province in 1559 was presented to the shogun.

They also appeared in temple legends. At Kannonshōji Temple in Ōmi, it is said that a fisherman who had committed murder in a previous life was reborn as a hideous ningyo. Prince Shōtoku built a temple there in response to its prayer for salvation.

Another tale tells of Yao Bikuni, a woman who ate ningyo flesh and gained extraordinary longevity.

The appearance of a ningyo was often taken as an omen. When one washed ashore in Akita in 1213, a diviner declared it a sign of war. That same year, rebellion broke out. When another was seen in Tsugaru in 1222, prayers were offered, yet unrest followed.

Some said killing a ningyo brought disaster. In Wakasa Province, a fisherman slew one, and soon a great storm and earthquake destroyed the village. The creature was believed to have been a messenger of a sea deity.

At other times, a ningyo was considered auspicious. One that washed ashore in Hakata was taken as a sign of long life for the nation and believed to be a messenger from the Dragon Palace. It was buried, and the temple there was named Ryūgū-ji.

In later times, stories spread that seeing a ningyo’s image could ward off illness, and that its flesh could grant long life. Even so, whether blessing or disaster, the ningyo remained a mysterious being of the waters—human-faced, fish-bodied, and never entirely of this world.

Gallery

Sources

tyz-yokai.blog.jp contributors. (n.d.). Ningyo. In tyz-yokai.blog.jp, from https://tyz-yokai.blog.jp/archives/1077741608.html

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Amabie

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Tradition / Region: Japanese Mythology
Alternate Names: Amabiko, Amahiko
Category: Mermaid, Yokai

The Myth

In the third year of Kōka, in the middle of the fourth month (1846), strange lights were seen shining upon the sea in Higo Province. Night after night the glowing shape appeared offshore, casting an eerie radiance over the waves.

At last, a local official went to investigate. Approaching the coast, he beheld a mysterious being rise from the water. It had long hair and a mouth shaped like a bird’s beak. Its body was covered in scales from the neck downward, and from beneath it extended three legs—or three fin-like limbs—supporting it at the shore.

The creature spoke.

“I dwell in the sea,” it said. “For six years from this year, the harvest will be abundant. But after that, an epidemic will spread across the land.”

The official listened in fear as the being continued:

“If disease spreads, draw a picture of me and show it to the sick. Those who see my likeness will be protected.”

Having delivered its prophecy, the creature returned to the sea and vanished beneath the waves.

News of the encounter spread quickly through printed bulletins. Woodblock sheets bearing the creature’s image were copied and distributed so that people might keep them as charms against illness. The strange being was called Amabie.

In other tellings, similar creatures appeared under the name Amabiko or Amahiko—three-legged prophetic beasts who likewise warned of plague and commanded that their portraits be displayed to avert disaster. Some were described as ape-like, some as bird-like, some glowing in the night. But the Amabie of Higo remained the most vividly remembered: the long-haired, scaled messenger of the sea who promised both abundance and pestilence.

And so her image endured—drawn and redrawn—whenever fear of sickness rose, her strange form offered as protection against unseen calamity.

Gallery

Sources

Wikipedia contributors. (n.d.). Amabie. In Wikipedia, The Free Encyclopedia. Retrieved February 14, 2026, from https://en.wikipedia.org/wiki/Amabie

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Namiko

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Tradition / Region: Japanese Mythology
Alternate Names: Girl of the Sea
Category: Mermaid

The Myth

During one summer in Kamakura, a clever but willful girl named Namiko went to stay near Yuigahama Beach while her sick mother rested in a hospital nearby. Though she excelled at school, at home she was stubborn and often caused her father trouble with her selfishness.

One day, while playing alone on the shore, Namiko encountered an old woman selling fish. Among the catch was a beautiful striped sea bream, its scales gleaming in the sunlight. Entranced by its natural beauty, Namiko declared that she wished she could be as beautiful as that fish.

The old woman laughed.

“A kimono fades and wears out,” Namiko insisted. “But a fish’s beauty never falls away. If I were as beautiful as that, I would never lose it.”

“Then become a fish,” the old woman said, her eyes sharpening.

“Yes, I would!”

At once the old woman’s laughter ceased. She chanted a strange sutra, and before Namiko could protest, she was transformed into a striped sea bream. The fish-seller’s true form was that of a powerful magician.

Thrown into the sea, Namiko swam bewildered through the underwater world. At first, she was amazed by the shimmering waters and the strange creatures gliding past her. It felt like exploring a living aquarium. But as the currents grew rough and hunger gnawed at her, she was forced to eat small fish she once would have admired. She could not cry; fish have no tears. Loneliness overtook her, and she longed for her parents.

Resting against a rock on the ocean floor, she lamented her foolish words. “All I did was stubbornly wish to be a fish.”

Meanwhile, on the shore, her father and their maid searched desperately. When they found her clothes abandoned on the beach, they believed she had drowned. Their grief was unbearable.

Then the old woman appeared before them.

“Your daughter lives,” she said calmly, and instructed Namiko’s father to take a boat out to sea the next morning.

At dawn, they followed her directions. Pointing to a struggling striped sea bream in the waves, the old woman declared, “That fish is your daughter.”

Understanding that this had been a lesson for his child’s stubborn pride, Namiko’s father fell to his knees and begged the magician to restore her.

As he lifted the sea bream into his arms, the old woman once again chanted her spell. The fish began to grow, its head transforming first, then its body, until Namiko stood once more in human form. Father and daughter embraced in tears, and Namiko vowed never again to let selfish pride rule her heart.

The magician suddenly vanished.

Then a voice drifted down from the sky. The old woman spoke, saying that though she had once used magic to torment many, she had now redeemed herself by correcting Namiko’s ways. Her sins were forgiven, and she would ascend to heaven.

She warned of a coming storm and asked Namiko to send down five-colored thread from the shore.

That afternoon, as winds rose and the sky darkened, Namiko kept her promise. A five-colored thread was cast toward the sea. From the heavens, the old woman—now transformed into a dragon—received it as she ascended.

After that day, Namiko treated her parents with devotion and filial piety. Her mother recovered from illness, and peace returned to their home.

And by the sea at Yuigahama, people remembered the tale of the girl who became a fish—and the dragon who rose to heaven.

Gallery

Sources

tyz-yokai.blog.jp contributors. (n.d.). Namiko. In tyz-yokai.blog.jp, from https://tyz-yokai.blog.jp/archives/1077741623.html

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Jinja hime

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Tradition / Region: Japanese Mythology
Alternate Names: Hime uo (Princess Fish)
Category: Mermaid, Yokai

The Myth

In the year 1819, on a lonely shore in Hizen Province, an unusual creature was seen upon the sand.

It was long and serpentine, nearly six meters in length. Two horns rose from its head. A dorsal fin ran along its back, and flippers lay against its sides. Its tail stretched behind it like that of a great sea serpent. Yet its face was not that of a fish. It was the face of a woman.

The creature spoke.

“I am a messenger from Ryūgū,” she said, naming the palace of the Dragon King beneath the sea. “My name is Jinja hime.”

She declared that for seven years the land would enjoy abundant harvests. Rice would grow thick and heavy; the people would prosper. But after those seven years, a great sickness would spread across the country—an epidemic that would bring suffering and death.

Yet she offered hope.

“Those who look upon my image,” she said, “will avoid hardship and be granted long life.”

Having delivered her prophecy, the shrine princess slipped back into the sea and vanished beneath the waves.

Her likeness was drawn and shown to the people, so that they might gaze upon it and be protected. The image spread from hand to hand. Fishermen, farmers, and townsfolk spoke of the sea princess who foretold both blessing and plague.

From that time on, stories began to circulate across Japan of other strange beings who emerged from the sea or the mountains to warn of disaster and promise protection through their image.

But it was Jinja hime—the shrine princess of the deep—who first rose from the waters, spoke of fate, and returned to the palace of the Dragon King below.

Gallery

Sources

yokai.com contributors. (n.d.). Jinjahime. In yokai.com, from https://yokai.com/jinjahime/

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Kidoku

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Tradition / Region: Japanese Mythology
Alternate Names: Oni-doku
Category: Mountain dweller, Demon

The Myth

On the thirteenth day of the eighth month in the second year of Kan’en (1749), a strange and terrifying event took place in Soma County of Hitachi Province.

Atop Mount Masakado stood an ancient pine tree. It was said to have grown there since the days of Taira no Masakado, its roots gripping the mountain for generations. But that year, long and relentless rains soaked the land. The mountain soil eroded, and floodwaters rushed down its slopes, exposing the roots of the old pine. Then a fierce wind arose and toppled the great tree from its base.

When the pine fell, something was revealed beneath its roots.

Buried in the earth lay a monstrous being—what people called a “Kidoku,” a Demon Slayer, though no one knew its true nature. As the rain beat down upon it, the creature awoke and began to scream.

Its cries echoed across the castle town below. The sound was so dreadful that men, women, and children alike were seized with terror. Some collapsed where they stood. Others fled indoors, covering their ears. The wailing did not cease.

The castle’s commander gathered a rifle squad and marched to the mountain. The creature, fully exposed now, writhed and shrieked beneath the fallen pine. It was immense—said to be the size of eight tatami mats laid side by side.

Those who saw it described a form like a monstrous ogre mixed with a crab. Its eyes were round and bowl-like, shining with an eerie light. The top of its head was sunken inward. Crimson hair, stiff and sharp like palm leaves, bristled from its scalp, and beneath its chin grew spiky strands like thorns. Its teeth were bared in rage.

The riflemen fired again and again. After several shots, the monster finally fell silent.

Thus the Kidoku was slain, and the mountain returned to stillness. But people long remembered the day when the ancient pine fell, and a screaming demon rose from the earth beneath its roots.

Gallery

Sources

tyz-yokai.blog.jp contributors. (n.d.). Kidoku. In tyz-yokai.blog.jp, from https://tyz-yokai.blog.jp/archives/1077741605.html

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Grand mononoke

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Tradition / Region: Japanese Mythology
Alternate Names: Gurannumono no Kai
Category: Mountain dweller

The Myth

In the mountains of Tohoku there is said to dwell a vast and terrible being known as the Grand Mononoke.

Long ago, in a remote region whose name was later said to echo that of a foreign missionary who once passed through during the Azuchi–Momoyama period, strange rumors began to spread. Shepherds whispered of livestock vanishing without a trace. Hunters spoke of something immense moving through the forest with unnatural speed. Yet no ordinary beast could have done such things.

The creature was described as a fusion of many spirits, as if the mountain itself had gathered its most fearsome yokai and bound them into one body. It stretched ten meters in length. Its form seemed to combine the long coils of a giant serpent, the cunning face of a shapeshifting cat, the features of a tengu, and the watery hints of a kappa. It was neither one thing nor another, but a union of spirits.

Despite its enormous size, the Grand Mononoke moved swiftly. When hunger stirred it, it descended from its hidden lair to seize cattle or horses, carrying them off into the forest to be devoured. These attacks were rare but unforgettable.

Most of the time, however, it remained secluded deep in the mountains. It did not wander openly, nor did it terrorize villages without reason. Because of its reclusive nature and overwhelming presence, the people came to regard it not only with fear but with reverence. Some believed it was no mere monster but a mountain god in a terrible form. Offerings were made in quiet places. Prayers were whispered to appease it.

Thus the Grand Mononoke became a hidden sovereign of the high peaks—an emperor of demons who ruled unseen, dwelling in shadow, appearing only when the balance between humans and the wild was disturbed.

Gallery

Sources

tyz-yokai.blog.jp contributors. (n.d.). Grand Mononoke. In tyz-yokai.blog.jp, from https://tyz-yokai.blog.jp/archives/1073956690.html

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Yama-otoroshi

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Tradition / Region: Japanese mythology (Mount Tsurugi, Tateyama range)
Alternate Names: Otoroshi
Category: Mountain dweller, Yokai

The Myth

High in the rugged peaks of Mount Tsurugi in the Tateyama mountain range, there was once said to dwell a fearsome yōkai known as Yama-otoroshi.

For generations, climbers failed to conquer the mountain. The reason, people whispered, was not the sheer cliffs or treacherous winds, but the presence of this demon. Yama-otoroshi waited upon rocky outcrops, silent and unmoving like a statue. It resembled a red-skinned ogre, with two horns rising from its head. Yet unlike the usual oni, it carried no iron club.

When a climber ventured too near, the creature would suddenly spring to life. With terrifying strength it would seize the victim by the collar and hurl them down the mountain slopes, casting them into the abyss below. Many believed the mountain itself rejected intruders through the hands of this guardian.

After the Meiji period, it was said that Yama-otoroshi descended from the heights of Mount Tsurugi and took up residence at temple gates. There, it no longer needed the “Yama” in its name and was simply called Otoroshi. Instead of casting climbers from cliffs, it guarded sacred thresholds. Anyone who approached without faith—those who mocked or doubted—risked being seized by the collar and violently thrown back, barred from entry.

Illustrations show the red-faced, horned demon grasping a struggling climber and tossing him away with ease, its expression fierce and unyielding.

Thus Yama-otoroshi stood as a mountain terror and later as a stern temple sentinel—an ogre who cast down the unworthy, whether from the heights of stone or from the gates of the sacred.

Gallery

Sources

tyz-yokai.blog.jp contributors. (n.d.). Yama-Otoroshi. In tyz-yokai.blog.jp, from https://tyz-yokai.blog.jp/archives/1058924391.html

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Kazou

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Tradition / Region: Japanese Buddhist mythology
Alternate Names: —
Category: Mountain dweller, Elephant

The Myth

In the depths of the Buddhist cosmos, beyond the human world and far below the mountains that encircle Mount Sumeru, lies the Fire Elephant Hell. There dwells the terrible beast known as Kazou.

This hell is reserved not for the ignorant, but for those who once knew the Dharma. They had entered the Buddhist path, shaved their heads, donned robes, and received the pure precepts of the Tathagata. Yet despite their vows, they succumbed to lust and desecrated sacred images. Their betrayal of faith cast them down into this inferno.

Between the vast Iron Encircling Mountains—those final barriers at the edge of the world—the Fire Elephant Hell burns without end. There stands the great fire elephant, enormous and dreadful. Smoke pours from its mouth and eyes. Flames surge from its body as though its flesh were a furnace.

When the condemned monks are brought before it, they are struck motionless by terror at its overwhelming presence. Paralyzed by fear and the heat of its blazing form, they cannot flee. Horse-headed jailers seize them and hurl them onto the elephant’s back.

With a roar like thunder, the fire elephant charges forward. Its burning hide scorches the sinners. The monks fall from its back into the flames below, where their bodies are crushed beneath its massive feet. Some are trampled into ash. Others are seized in its blazing jaws and devoured.

Yet death offers no release. Day and night, a thousand times over, they die and are reborn in that same place, only to suffer again. The elephant’s flames never dim, and its fury never tires.

Thus the Kazou stands as the terror of the Fire Elephant Hell—an embodiment of burning remorse and unending punishment for those who betrayed their sacred vows.

Gallery

Sources

tyz-yokai.blog.jp contributors. (n.d.). Kazou. In tyz-yokai.blog.jp, from https://tyz-yokai.blog.jp/archives/1010654402.html

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Shishikori

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Tradition / Region: Japanese mythology
Alternate Names: —
Category: Mountain dweller, Yokai

The Myth

In the village of Narabayashi in Buzen Province, a strange terror began to visit the people. Night after night, the peasants’ horses and cattle vanished without a trace. No broken fences, no blood, no tracks—only empty stalls and fear.

At first the villagers whispered of thieves. Then of wolves. But the disappearances continued, and dread settled over the village.

Only one farmer, a man named Fujisuke, had been spared—until the night his turn came.

As darkness fell, Fujisuke noticed a sharp, fishy odor drifting through the air. It grew stronger and stronger, thick and suffocating. Then, from the shadows, a monstrous shape entered his stable.

Before his eyes, the creature seized his cow and swallowed it whole.

Frozen in terror, Fujisuke could do nothing but watch. When at last he found the strength to move, he fled and ran to the village headman, breathless and pale, and told what he had seen.

At dawn, the villagers gathered for a mountain hunt. Armed with bamboo spears and driven by fear and anger, they followed the lingering stench into the hills.

Deep in the mountains, they found a cavern from which the same foul, fish-like odor poured. Inside, crouched in the darkness, was the monster.

It was enormous—six feet tall, with a mouth so vast it measured more than a meter across. Its presence filled the cave like a nightmare given flesh.

The men attacked together, thrusting their bamboo spears again and again until the beast collapsed.

When it lay dead, an old villager stepped forward, peered at the slain creature, and said quietly:

“This is the Shishikori.”

And so the name of the devourer of cattle was spoken, and the terror of Narabayashi came to an end.

Gallery

Sources

TYZ-Yokai Blog contributors. (n.d.). 獅子狩 (Shishikori). In TYZ-Yokai Blog, from https://tyz-yokai.blog.jp/archives/1010654244.html

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Suiton

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Tradition / Region: Japanese mythology
Alternate Names: —
Category: Mountain dweller, yōkai

The Myth

On the wide uplands of the Hiruzen Plateau, where the wind moves across open fields and the mountains stand watch at the border of Okayama and Tottori, there is said to dwell a fearsome being known as the Suiton.

The Suiton does not roam idly, nor does it trouble the innocent. It waits.

It is said that the creature can read the hearts of men. It knows when someone harbors malice, when a traveler plots harm, when deceit or cruelty takes root in the mind. The moment such thoughts grow strong, the Suiton appears.

Without warning it swoops down before the wrongdoer, blocking the path. It stands balanced on a single leg, towering and terrible. Before the guilty can flee or beg for mercy, the Suiton tears them apart and devours them.

There is no escape from it, for one cannot hide one’s thoughts.

Because of this, the people of Hiruzen say that there are no wicked men in their land. For anyone who intends evil knows that the Suiton is listening, and that the mountains themselves will judge them.

Thus the plateau remains peaceful—not by law or by sword, but by the silent vigilance of the one-legged guardian who feeds only on wicked hearts.

Gallery

Sources

TYZ-Yokai Blog contributors. (n.d.). 水遁 (Suiton). In TYZ-Yokai Blog, from https://tyz-yokai.blog.jp/archives/1010653984.html

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