Due to his powerful, wolf-like sense of smell, Aoki Juurou finds murder victims a little too often, causing some cops to suspect him of being involved.
This particular case begins when he discovers the body of the idol Komori Erie by following the strong scent of her blood. After dealing with the police, Aoki takes the details of the case to the vampiric shut-in Hisato, who has his own mysterious powers. If Hisato can solve the case, Aoki can take justice into his own hands or claws.