Fast-paced Japanese action movie in which a pair of gangsters do battle in unconventional fashion. When Shonzo Iwaki (Tak Sakaguchi) returns to Japan from South America he is enraged to learn that his father, crime boss Kenzo (Akaji Maro), was betrayed and murdered by his second-in-command, Kurawaki (Shingo Tsurumi), who has proceeded to assume control of the family's empire. Shonzo confronts Kurawaki and the pair do battle, leaving both with severe injuries. Helpfully for Shonzo, he awakes in a mysterious medical facility to find out that his two injured limbs have been replaced with a rocket launcher and a machine gun. Shonzo once again seeks out Kurawaki, who has had similarly potent surgery, and the pair prepare themselves for an even more destructive showdown...