Kogure is a devil summoned by Sou Kurosaki to take his virginity. To Sou's horror, Kogure is male, despite looking like a pretty young girl. Because of the devil's pact, he can't go back to hell until Sou's wish is fulfilled. After realizing his mistake, Sou attempts to flee from Kogure. To accomplish his contract, Kogure starts living with Sou and even transfers to his school under the guise of being his female cousin, Kogure Deimon.