Isonade is a sea monster of western Japan. Its body resembles a shark, but its tail fin is said to bristle with countless fine spines. It appears when the north wind blows hard, approaching as lightly as a hand passing over the water. Without showing itself, it hooks people from the deck with its barbed tail, drags them into the sea, and swallows them. Edo-period collections of strange tales, including Ehon Hyaku Monogatari, and works of natural history both record the creature. Its name is said to come either from the way it 'strokes' the surface or from the deceptively slight movement with which it takes a victim. For sailors, Isonade embodied a maritime disaster almost impossible to prevent.
Folklore & Legends
Around Matsuura in Hizen, a sudden change in the color of the sea and a wind that seemed to rise from below were taken as signs that Isonade's tail was already above the surface. The rest of the creature remained unseen until it struck; by the time anyone noticed it, the tail spines had caught their victim. In the Kumano region of Mie, an unexplained death near the coast might be described as someone having been 'stroked by Isonade.' Old books also use names such as Kyokō-wani, the 'giant-mouthed crocodile.' Names and details vary by region, but every version treats the creature as a grave threat to safety at sea.
Edo-period strange tales and works of natural history describe Isonade as a sea monster that approaches without disturbing the surface. A crew may notice only a change in the water's color or the wind before the danger is already beside the ship. Its body resembles a shark, with coarse projections and needlelike growths extending from the back toward the tail.
Isonade is most often associated with cold, cutting winds, and days of strong northerlies were treated with particular caution. Sailors avoided noisy work, put nets and ropes in order, and kept away from the rail. Such practical rules became part of the story's warning. Names and details differ from place to place, but the core remains the same: Isonade arrives invisibly, and by the time it is seen, a sweep of its barbed tail has already pulled someone overboard.
Character Profile
This section is our own creative profile for storytelling. It is not historical fact or scholarship.
Cunning and silent, drawing close before anyone can see it.
Compatibility
It is dangerous to sailors and coastal fishers, especially anyone standing close to the edge of the deck.
Abilities
Approaching with barely a ripple, as though stroking the seaHooking people with the countless spines on its tail finAnnouncing its presence through changes in the wind and the color of the water
Weaknesses
No definite weakness is recorded; tradition says only that it is less likely to enter shallow water or sheltered inlets.
Habitat
Waters off Matsuura in Hizen, the western Japanese coast, and the Kumano Sea.
Interested in this type of yokai?
Discover the yokai most similar to your personality with our yokai diagnosis
The diagram below is a diagnostic evaluation chart for Isonade, Gliding beneath the North Wind. The higher the value of each item, the stronger that characteristic is expressed.
Meet your guardian yokai at the shrine
Draw an omikuji fortune and discover the yokai watching over you today.
