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TRANSLATION: beach stroker
ALTERNATE NAMES: ō-kuchi-wani (giant mouthed sea monster)
HABITAT: shallow seas and coastal waters of West Japan
DIET: carnivorous

APPEARANCE: Isonade are mysterious shark-like sea monsters which scour the rocky coastlines searching for boats to scuttle and fishermen to snatch. Their bodies are enormous, and their fins are covered with countless tiny metallic barbs, like a grater. They use these to hook their prey, dragging it deep into the water to be eaten. They are said to appear when the north winds blow and the sea currents change.

BEHAVIOR: Despite their size, isonade are incredibly elusive. They move through the water with unparalleled grace. They can swim without creating so much as a splash, making them very difficult to notice. By the time most sailors have noticed that the winds have changed and a strange color is upon the sea, it is too late; a huge tail is already rising out of the water, above their heads. When isonade strike, they do not thrash about violently like a hungry shark, but instead hook their prey on their fins or tail with a gentle stroking motion, dragging them into the depths almost peacefully. They do this without a sound and without ever showing their bodies, making them all the more dangerous for their stealth.

Iso onna


TRANSLATION: coast woman
HABITAT: coasts, particularly rocky ones; native to Kyushu
DIET: blood

APPEARANCE: Iso onna are dangerous vampires from Kyushu and Western Japan looking for fisherman and travelers to feed upon. They are closely related to nure onna, despite having no serpentine features at all. Iso onna wander rocky beaches, hunting for prey.

Individual accounts of iso onna vary quite a bit when it comes to their appearance. In most cases, they appear as beautiful women who have just come out of the water, dripping wet. Their hair is long and matted, reaching almost all the way down to the sand. Their eyes are heavy with sultry, sexual energy, and their wet clothes stick, nearly transparent, to their skin. From the waist up, they appear like ordinary human women, albeit soaking wet, while from the waist down, they are slightly blurry and transparent, betraying their ghostly nature. In some regions, iso onna are said to have serpentine bodies like nure onna, while in other regions they are said to be large enough to crush ships out at sea, like umi-bōzu. They also have the ability to disguise themselves perfectly as large beach rocks when they don’t want to be seen.

INTERACTIONS: When Iso onna appear to humans on sandy beaches, they look like beautiful women, staring far out to sea. When somebody approaches and tries speak to them, they turn around and let out an ear-piercing shriek, which stuns their victim. Then they lashes out with their long hair and drag their prey into the sea, where they drains their victim’s blood with their hair.

On rocky coasts without sandy beaches, iso onna appear sitting on the cliffs and calling out to passersby in an eerie voice. Their victims are mesmerized into walking straight towards them, ignoring the dangers posed by the rocky cliffs. They walk off the cliffs and fall to their deaths, leaving the iso onna free to feed on their bodies.

Iso onna are occasionally encountered far out at sea, but they otherwise act the same as they do on land, capturing their human prey and draining their victims’ blood using their long hair.

Iso onna are most commonly encountered during the holiday seasons of Obon and New Years Eve, when the border between the realm of the living and the realm of the dead can be more easily crossed. They occasionally cooperate with ushi oni to catch their prey.

Nure onna


TRANSLATION: wet woman
ALTERNATE NAMES: nure-yomejo
HABITAT: coasts, rivers, and other bodies of water; native to Kyushu
DIET: blood

APPEARANCE: Nure onna are vampiric sea serpents who haunt shores and rivers, looking for humans to eat. They are most commonly found on the shores of Kyushu, but there are stories of nure onna encounters as far north as Niigata and as far east as Fukushima. There are two variations of nure onna: one without arms, which resembles an enormous sea serpent with a woman’s head, and one with human-like arms. Aside from this difference, the two varieties look and act in exactly the same manner. Their faces are hideous and often betray serpent-like features, such as a forked tongue. They have long black hair which sticks to their dripping bodies. The name comes from the fact that they always appear sopping wet.

INTERACTIONS: While physically much stronger than a human, nure onna prefer to use trickery and guile to catch their prey, rather than relying on brute force. They most often appear on the coast near the water or by a riverbank, magically disguised as a distressed woman carrying a bundled up baby. They cry out for help from fishers, sailors, or anybody passing by. When the prey approaches, a nure onna will plead with him to hold her baby for just a moment so that she can rest.

If he agrees and takes the bundle, it quickly becomes as heavy as a boulder, and her victim is unable to move. The Nure onna is then free to attack her helpless victim, feeding by draining his blood with her long, serpentine tongue.

Nure onna frequently appear together and cooperate with ushi oni, as they inhabit the same environments and share the same diet.

Ushi oni


HABITAT: usually along the coast or near bodies of water; found in West Japan
DIET: varies from type to type, but always carnivorous

APPEARANCE: A terror from Western Japan, ushi oni is a class of monster that lives near water. The name literally means “ox demon,” and it can actually refer to a number of different monsters with bovine traits. Most ushi oni they resemble an ox from the head up, and a demonic horror below the head. Many forms are known to exist; the body of an ox with a head like an oni’s; the head of an ox on a body like a spider’s or a cat’s; or even an ox’s head on the body of a kimono-clad human (a Japanese version of the minotaur).

BEHAVIOR: Despite their unique and varying morphology, all ushioni share a number of characteristics, pointing to a common origin. They are exceedingly cruel and savage beasts, they breath toxic poison, and they like to eat humans. Some ushi oni are lurkers, attacking people who draw too close to their lairs; others are hunters, roaming the coasts seeking prey; the cruelest ones ravage the same towns over and over, inflicting terrible curses or bringing diseases with them. Most ushi oni live along the rocky coasts and beaches of Western Japan, although a few roam the mountains of Shikoku.

Ushi oni frequently work together cooperation with other yokai. The spider-like version from the coasts of northern Kyushu and western Honshu frequently partners with nure onna and iso onna, who use their charms to lure unsuspecting men towards the water’s edge. When they approach, the ushi oni pounces upon them and bites the victims to death, and the meal is shared between the yokai.