The most famous rokurokubi story ever told in English isn't really about a rokurokubi. Lafcadio Hearn's 1904 collection Kwaidan includes a tale called "Rokuro-Kubi," in which a wandering monk stumbles on a mountain hut and finds its five occupants lying headless after dark, their necks unmarked by any blood. That's a different, nastier creature. The mix-up is old, understandable, and says something real about how blurred these two yokai have always been in the retelling.
What does it look like?
By day, a rokurokubi looks like an ordinary woman, indistinguishable from anyone else in the house or village. After she falls asleep, her neck begins to lengthen — sometimes just far enough to peer into a neighboring room, sometimes stretching yards down a corridor or out a window into the night. The body stays put; only the neck travels, thin and rope-like, carrying the head to wherever it wants to look. Toriyama Sekien drew her this way in Gazu Hyakki Yagyō (1776), the first volume of his four-part bestiary: a well-dressed woman in an elegant kimono, her neck curved out at an angle no living spine could hold.
The name itself points at the mechanism. Rokuro (轆轤) is the word for a potter's wheel, and also for the pulley on a well bucket or the sliding shaft of an umbrella handle — anything that extends on a spool or a hinge. Kubi (首) is simply neck, or head. A rokurokubi's neck is imagined less like flesh and more like a winch paying out rope.
The other kind: when the head leaves entirely
Japanese folklorists distinguish the rokurokubi from a closer, more dangerous relative called the nukekubi (抜け首, "slip-off head"). In a nukekubi's case, the neck doesn't merely stretch — the head detaches completely and flies off on its own, hunting for blood or insects while the body lies motionless. A nukekubi is considered the more violent of the two, and the more dangerous to disturb: folklore warns that if someone moves or hides the sleeping body while the head is away, the head cannot reunite with it and the victim dies. Often, neither kind of creature knows what it is. Both are sometimes described as unaware of their own affliction, waking each morning with a memory of a strange dream — of having seen the town, or the room next door, from some impossibly stretched-out angle — and no idea it happened while they slept.
This is the confusion Hearn's story falls into. His monk finds heads that have come loose entirely and gone hunting on their own, which is nukekubi behavior by any modern classification, yet the story is titled "Rokuro-Kubi" and Western readers have called the whole family by that name ever since.
Where it comes from
The trail runs back to China. The Soushen Ji ("In Search of the Supernatural"), a collection of strange accounts assembled by Gan Bao in the fourth century, records a people called the Luotoumin, or "drop-head people," and describes a Wu-dynasty general's maidservant whose head detached and flew off every night while she slept. A related account, the Feitouman (飛頭蠻, "flying head barbarians"), places similar people in the caves of Lingnan, in what is now southern China and northern Vietnam, marked by a red scar around the neck, using their ears as wings to hunt insects after dark and returning to their bodies by morning. Edo-period scholars knew these Chinese sources directly — the encyclopedia Wakan Sansai Zue cross-references the flying-head legend when discussing rokurokubi — and the imported story fused with homegrown Japanese kaidan once it crossed the sea. Domestic tellings appear by the seventeenth century: the 1663 story collection Sorori Monogatari and the 1677 Shokoku Hyakumonogatari, the latter setting a nukekubi tale in Echizen province.
Rokuro-Kubi in Kwaidan
Hearn's version deserves telling on its own terms. The monk, Kwairyō, was once a samurai named Isogai Heidazaemon Taketsura before he took vows after his lord's defeat. Sheltering for the night with a hospitable woodcutter in the mountains, he wakes to find the man and his four companions reduced to headless bodies, throats unmarked, no blood anywhere. Kwairyō realizes what he's found, arms himself by tearing a young tree out of the ground, and beats back the flying heads as they return and lunge at him one by one. Four flee; the fifth, the host's own head, locks its teeth into his sleeve and won't let go no matter how many times he strikes it — until dawn forces the truth of what he's caught out into the light.
Rokurokubi today
The neck-stretching yokai has had a long afterlife as a recruitable demon in Atlus's Megami Tensei franchise, going back to spin-off entries like Devil Children Black Book & Red Book, where the games keep the core image intact: an ordinary-looking woman by day, capable of something no human neck should do once night falls. The split between rokurokubi and nukekubi still trips people up in exactly the way it tripped up Hearn — plenty of modern retellings use "rokurokubi" as a catch-all for both the stretching neck and the detaching head, folding a century-old translation quirk into how the story keeps getting told.