It's the 2030s. The Boy Detectives Club gathers under Kogor? Akechi, the mysterious detective. The group simplifies instances small and great using their skills. A member of this team , Kensuke Hanazaki, meets the boy Yoshio Kobayashi, one evening. Kobayashi's human body can't die due to the effects of this"Unidentifiable Mist," however he yearns for departure, and shirks from contact with different men and women. Accepting an interest in him, Hanazaki invites him to join with the Boy Detectives Club. Their meeting is attached to this fate linking together Kogor? Akechi, and the age of greatest actress, the Fiend With Twenty Faces.