Kaidan
see also: 日本語
Kaidan are ghost stories
Obake or [: :JapaneseGhosts]: Obake, the Japanese "ghost," is exactly what its name suggests: o is an honorific prefix, while bake is a noun from bakeru, the verb meaning "undergo change." Japanese ghosts, then, are essentially transformations. They are one sort of thing that mutates into another, one phenomenon that experiences shift and alteration, one meaning that becomes unstuck and twisted into something else. Obake undermine the certainties of life as we usually understand it.
Onryō (怨霊): is a Japanese ghost who is able to return to the physical world in order to seek vengeance.
While male onryō can be found, mainly in kabuki, the majority are women. Powerless in the physical world, they often suffer at the capricious whims of their male lovers. In death they become strong.