[1][2] The film opens with Isshin Higaki (Sonny Chiba) and his daughter Yumi Higaki (Etsuko Shihomi) being attacked by a rival karate master, Hironobu Nikaido (Bin Amatsu) who wants Isshin's job as top karate master.

Nikaido teams up with four other masters and they manage to disable one of Isshin's arms and wound his eye with a kunai knife.

Alive but crippled Isshin and Yumi retreat to New York where he trains his daughter to avenge him and the death of a friend.

She enters a karate tournament funded by a corrupt business man, but Nikaido, seeking to assure his student's supremacy in the coming fight, sends his four top fighters to wipe out the rest of the competition.

Eventually, Yumi, with the help of another karate student, Masahiko Okizaki (Yasuaki Kurata) kills Nikaido and his minions.