Kitsune-Tsuki (狐憑き Kitsune-Tsuki, lit. Kitsune Possession) is a term referring to symptoms or a person haunted by kitsune.
It was appearing in a graveyard of a mountain to chew on fish heads every night, and was initially hypothesized as Kubi-Kajiri, but turned out to be Kitsune-Tsuki possessing a corpse. When it lost against Kitarō, it then controlled Yuki-Hime and went violent, and chased away Kitarō and others from the GeGeGe House. However, Kitarō swallowed its spirit when it got drunk, and vaporized it with his internal radiation.