Riki-Oh, a young man who has superhuman strength, is incarcerated in a private prison, where inmates are treated like slaves. He is forced to use his unstoppable form of martial arts to destroy the corrupt officials and their lackeys.
With the privatization of all correctional facilities by the year 2001 AD, prisons have become faceless commercial enterprises, interested only in profit. Under those circumstances, an unfortunate young convict sentenced to 10 years in prison for manslaughter, Riki-Oh Saiga, enters the prison's gates unaware that the place is governed by the vicious monocular Warden Dan and his pitiless lackeys, the dreadful Gang of Four. However, there is far more to Riki-Oh than meets the eye, as he is a devastating weapon of martial arts who defies corruption, thirsting to make all those who wronged him pay the price. And they will.
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