
A clandestine martial arts competition is to be held in Hong Kong, for which an American soldier is also preparing. As a child, he became the adopted son of a Japanese karate teacher, achieved perfection through hard training and received a sacred Japanese sword as a sign of success.
He arbitrarily leaves the military unit and goes to Hong Kong on a "Kumite". In the footsteps of a young man goes the FBI. Despite all the obstacles that arise on the way karateka, he manages to achieve victory and join the Brotherhood of the Black Dragon ...