A high-school girl KEI has extraordinary athletic ability. Despite her strength in the karate dojo, the master MATSUMURA does not award her the coveted "Blackbelt". Matsumura tries to teach Kei that Karate is more than just fighting and that "the real strength is in the forms". Kei grows impatient. She decides to join KOWASHIYA (Destroyers). Kowashiya consists of masters of martial arts who simply destroy their targets. Kei becomes deeply involved until she discovers that the leader is planning to destroy Matsumura. Kei is shocked and decides to warn him. But they are on their way to destroy Matsumura.