Alive

Alive is a movie starring Hideo Sakaki, Ryô, and Koyuki. After survivng his own execution, Tenshu choses to be subjected to the bizarre experiments of the prison officials.
Tenshu is imprisoned and sentenced to death for murdering the men who raped his girlfriend. However, he manages to survive his execution and is presented with an option: face another execution attempt or subject himself to their bizarre and dangerous experiments.