Eiji Arima is a veteran detective who is about to retire. Shoichi Sera is a young lawyer and Misuzu Haruna is a prosecutor. These three people belong to the Gohan Taisakushitsu ("Misjudgment Countermeasure Office’". Their job is to re-examine death-row convictions and check to see if anyone was falsely convicted.

In the near future of a Japan, the ancient 'Act of Vengeance' is revived and professional executioners are permitted to kill criminals by the requests from their victims. People who are to be executed are notified of the execution time and date in advance and they are allowed to have their own guard.

Yuichiro is a college student whose sister went missing 15 years ago. That traumatic event hangs over him like a pall as he wanders Japan's S&M clubs. But his younger brother claims to be able to sense their sister with his "antenna".