HK Movie based on Izou Hashimoto (creator) and Tanaka Akio (artist) manga - Shamo.

After barbarically slaughtering his parents, sixteen year-old Ryo is sent to a prison for boys. Continually tortured by his fellow inmates, he trains in karate under Kenji Kurokawa, a man imprisoned after trying to assassinate the Japanese Prime Minister. Two years after his conviction, Ryo is released and begins a new life as an ultra-violent professional fighter.

Returned to society after three 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 from the society that has so completely rejected him.