轆轤首 – Rokurokubi (potter wheel neck)
Rokurokubi are normal women by day, but at night they gain the ability to stretch their necks to ridiculous proportions.
It is said that rokurokubi live undetected during daylight and may even take mortal husbands trying to keep their demonic forms secret. They are tricksters by nature, however, and their compulsion to frighten and spy on human beings is hard to resist. Some rokurokubi thus resort to revealing themselves only to drunks, the sleeping, or the blind in order to satisfy these urges.
Other stories say that the rokurokubis were humans who had broken Buddhist law. They feast on the blood, favoring that of those who had also broken religious doctrine.