Kagawa Eiji 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, Hasumi Kosuke is the ace from the Criminal Division of the same police station. He teams up with Eiji and Mizuki Nao, an emotionally detached rookie dective who is hard to hate.