Jun Shirogane's entire family is killed in a house fire set by criminal gang while she is away at a karate tournament.

She is given the cover identity of Jun Silver, a touring member of the Ladies Legend Pro-Wrestling team under manager Rumi Kazama.

Her first target is the blackmailer Mistress Nancy Otori, whom she interrupts dominating President Mah Sasazaki of Ryowa Bank.

President Sasazaki has her brought to his office and attempts to shoot her in order to keep his secret safe but she overpowers him as well as the members of the Otsunami Family, then returns to Mistress Nancy but is unable to find film negatives or a list of her clients.

Impressed with her skills, he offers her a truce but is then shot by an unknown female sniper as Jun escapes.