Karate master Kazuma Agaki (Shinichi Chiba) gets severely beaten and crippled by a vicious gang of thugs called the Big Four, lead by the evil Nikaido (Bin Amatsu) who’s after Agaki's job as "the top Karate instructor." Blinded in one eye, Agaki flees to New York City with his loyal daughter Yumi (Etsuko Shihomi) which pretty much ends her childhood as Agaki trains her to be his instrument of revenge