Muto Takashi is a former police detective who uses illegal methods to solve cases which are difficult to handle by the police. Kaburagi Wataru is a police detective and Muto's buddy, and Tamaki takes charge of the special missions given to Muto. While exploring the lives of these men, the topic of whether revenge is right or wrong is discussed in this drama.

Season 2 focuses on Kaburagi who used to date Muto's sister. He gets trapped by the consequence of his decision to take revenge while he and Muto clash over their views about revenge.