Natsume Takashi has the ability to see spirits, which he has long kept secret. However, once he inherits a strange book that belonged to his deceased grandmother, Reiko, he discovers the reason why spirits surround him.

While conducting research for a college project, Kayako befriends a lonely retired detective who can’t stop pondering his unsolved case out loud, Torao. Taking an interest in the case, the two embark on a journey to solve the mystery of a small town.