After barbarically slaughtering his parents, 16 year old Ryo is sent to a prison for boys. Continually tortured by his fellow inmates, Ryo takes up karate training after a savage beating leaves him for dead. Returned to society after 3 years, Ryo catches the attention of the local triads for his natural ferocity and dedication to destruction. Convinced to enter underground, no rules fighting tournaments, Ryo easily demolishes the competition. Seemingly unstoppable, Ryo's inevitable confrontation with champion Sugawara may be his only chance for respect by the society that has so completely rejected him.