The story takes place in Japan, in a world where murderers are imprisoned in a closed space and executed in the same manner as the victims, and the execution is broadcast live.
The newly sentenced death row inmate, Kaoru Oda, is a murderer who strangled his lover to death in a love affair.
Kohei Mizutani, a prison guard, is selected and ordered to carry out Oda's execution simply because of their similar physique.
Mizutani gets close to Oda by modifying his face into that of Watase, the victim and Oda's ex-lover, but...