Karate baka ichidai (1977)

Original title: 空手バカ一代

Sorry, no trailer
¯\_(ツ)_/¯

See full cast & crew

This movie is based on the true life story of a Korean fighter named Choi Bae-dal (who later changed his name to Masutatsu Oyama), the founder of Kyokushin Karate in Japan.