Tsukasa, a university student, is rescued from an attack by a devil, one of many vampires mingling with the human population. Anzai, Tsukasa's savior, is a half-demon who uses his supernatural powers as a secret police task force specializing in crimes associated with demons in Tokyo. Anzai's continued protection of Tsukasa creates a rapidly developing and uncertain bond between them. One of Anzai's greatest fears, the fear of drinking human blood, will be tested because of Tsukasa's ties. Can Anzai maintain this unshakable will not to drink human blood?
