Mayura is a somewhat obsessive girl who yearns for the supernatural. While skipping school to explore a 'haunted house', she discovers a talking doll, which is subsequently stolen by a local stray cat. While Mayura searches for the doll, she enlists the help of the Enjaku Detective Acency. Though at first she is turned away, Loki and his assistant, Yamino, follow after her in search of the paranormal doll.
Later, the doll requests that Mayura take it to the clock tower where she found it. While she is there, it begins to act even stranger than usual, frightening Mayura. The doll, offended by her behavior, goes berserk, levitating objects in the room and trying to kill Mayura. Loki stops it just in time, eventually reuniting it with its late owner.
Though the mystery is solved, Mayura continues to hang around the Detective Agency, attracted to the creepy atmosphere, Yamino's good cooking, and the mysteries that seem to gravitate toward Loki.