Eiji Kagawa is an assistant inspector from Sakuramachi Chuo Police Station. He used to be a detective in charge of dealing with organized crime groups, but he got into trouble and was demoted. Although Eiji looks like a gangster, he is not fond of the sight of blood. On the other hand, Kosuke Hasumi is the ace from the Criminal Division of the same police station. He teams up with Eiji and Nao Mizuki, an emotionally detached rookie detective who is hard to hate.