1993. In an unrestricted fighting competition held for the first time since the ancient Roman period, an unknown fighter from Brazil with a dwarf physique won without much injury. People soon began to become interested in the martial arts he used. Brazilian jiu-jitsu became known to the world.

Cheung-chan, a boy who cannot hit other people because of the trauma of his childhood. Through jiu-jitsu, a martial art that allows you to win without hitting, quietly defeat the opponent!