Kyouken Densetsu Crazy Knuckle

The story is about a martial artist called Zado who wants to be the world's most powerful martial artist. To achieve his dream, he sets out to collect little fragments that will unfold the secret of the ultimate martial arts skill. In order to learn the skill, he has to defeat the people who hold these individual fragments. However, Zado's most-trusted henchmen took all the fragments and learned the ultimate skill himself and defeated Zado. To regain his dignity, Zado has to defeat his henchman in the battle ring. [Edited from Anime Densetsu]