Riki-Oh: The Story of Ricky 4K 1991

In the not-too-distant future, a powerful corporation runs prisons where it uses the inhabitants as cheap labor. Ricky is sentenced to prison time for killing a triad boss who was involved in the death of his girlfriend. Ricky quickly learns the internal prison rules, where the inmates are in various crews that run certain aspects of prison life.

He soon falls into disfavor with the guards by protecting and supporting an innocent and the prison staff begins to take revenge on him. Ricky is perfectly skilled in martial arts. Very soon both guards and prisoners realize that it is useless to contact Ricky: he can bear any pain and with a single blow of his fist is able to pierce a man's chest. However, the warden has no intention of giving up....