Iso-onna (Shore Woman)Isonna of the Aft-Rope Crossing

EE-soh-OHN-nah

Aquatic Spirits🏞️ harbor fronts along Amakusa City, Kumamoto, inlets and boat havens of the Shimabara Peninsula, small harbors and river mouths at the stern during nights of calm

Detailed Description

A feared variant along Amakusa and the Shimabara Peninsula, named for slipping aboard by following the aft mooring rope. She appears as the upper body of a young woman scented with the sea, while her lower half is hazy and shifting like wave-shadows. Her long wet black hair constantly streams from her chest to the floor, branching into fine threads that cling to human skin. When a hush falls over the harbor at midnight, she stands in the lee of the shore or at a stern’s tip staring seaward, and will either echo the name of anyone who calls to her or answer with a piercing scream. At that cry she reaches a white hand to the aft rope, crosses soundlessly onto the boat, shrouds a sleeper’s face with her hair, and twists up blood strand by strand. By morning only a tide stain and a thin ring of hair remain at the pillow. Said to be the shape taken by the regrets of the drowned or a love unfulfilled by one who waited at the harbor, she is known as an isonna and also as nure-onna. The practice of avoiding the aft rope comes from this variant’s habit of treating ropes as roads. So long as she touches a line she can climb anywhere, but she does not swim about recklessly and prefers calm surfaces. On thin-moon nights some have seen her walk the water from shore, but only when the harbor tide lies asleep. She is weakened by light and prayer, so fishermen in unfamiliar ports avoid taking the aft rope, drop only the anchor, and keep the gunwale light burning. In Shimabara it is said that placing three dry thatch reeds from a roof upon one’s kimono while sleeping prevents tangling and wards her off. Those who touch her hair are seized by chill and lethargy, and the roar of the sea lingers in their ears for days. She is merciless toward mockery and rudeness, targeting first those who call her name without honorifics or taunt her with whistles. Conversely, she is said to avoid boats whose crews offer prayers for the lost at sea. Some tales claim that if you move behind her she resembles a rock shadow, and under moonlight her back becomes the outline of a wet reefs tone to let waves pass. The Isonna of the Aft-Rope Crossing is a grudge born at the liminal space of the harbor, hard to approach for those who keep the code and unforgiving toward arrogance, dropping her hair without mercy.

Source Information

種類全体の出典reference

妖怪事典

著者: 村上健司

年代: 2000

出版社: 毎日新聞社

信頼度: A関連度: 高

妖怪事典（オンライン）

種類全体の出典reference

綜合日本民俗語彙

信頼度: B関連度: 高

種類全体の出典primary

怪異・妖怪伝承データベース「磯女」

著者: 国際日本文化研究センター

年代: 2002-

出版社: 国際日本文化研究センター

信頼度: A関連度: 高

怪異・妖怪伝承データベース「磯女」（オンライン）

種類全体の出典primary

画図百鬼夜行

著者: 鳥山石燕

年代: 安永5年（1776年）

信頼度: A関連度: 高

画図百鬼夜行（国立国会図書館デジタルコレクション）

Personality

quiet and relentless, approaches without a word, answers provocation with a shrill cutting scream, bound by grudge and lingering regret, emotions sway like hair in the night wind

Compatibility

those who keep the laws of the sea and act with caution, sailors who maintain lights and prayers, those who refrain from needless calling out, extremely bad with people who mock carelessly, extremely bad with braggarts who shout for show

Abilities & Skills

⚡ aft-rope traversal—moves along ropes and lines as along a road⚡ slipping aboard without a sound⚡ hair-draining—splits her hair into threadlike strands to draw off body heat and blood on contact⚡ name-echo—returns a called name in a clear voice to seize attention and awareness⚡ rock-shadow guise—alters her back to resemble wet reef stone to be indistinguishable in darkness

Weaknesses

lamps and prayer—ship’s lights, sutra chanting, and memorial talismans repel her, dry thatch—placing three dry roof reeds on the body prevents tangling and weakens her power

Collection Inclusion

This yokai is included in the following collections:

The Illustrated Night Parade of a Hundred Demons

Toriyama Sekien’s 1776 yokai art book presenting one creature per leaf, the first in the “Gazu Hyakki Yagyo” series.

テーマ別

画図百鬼夜行百鬼夜行

Yokai of the Sea

A special feature on sea yokai—umibōzu, funayūrei, umizatō, kainan hōshi—tracing fear and faith in Japan’s maritime lore, including Iso-onna and Jinjahime.

注目

海島