The story takes place in the alternate world slightly different from ours. In United Republic of Great Japan, which has become the world¡¯s strongest nation, it is reported that a new breed of athletes is setting a phenomenal new world record, winning every sports game. Prompted by the pressure from other nations, JSA, the organization that supervises the country¡¯s sports events, decides to look into the matter, but the entire investigation team goes missing just when it started the mission. What the investigation team witnessed was ¡°Athlete-roid,¡± female-type cyborgs specifically designed for each sport. Koumoto, executive director of Great Japan Heavy Industries, is planning to dominate the world market for special military-use robots by promoting the army of invincible ¡°Athlete-roid.¡±... In the meanwhile two high school girls meet each other on their way to school. They are Ai Asaoka and Megumi Asaoka. Because of a trick of fate two girls get involved in a series of shocking incidents. Mistaken for her namesake, Ai undergoes a whole-body cyborg surgery when it was Megumi who volunteered for the operation. Mugumi comforts the distraught Ai and invites her to join her original mission, a battle to exterminate all ¡°Athlete-roids.¡± It¡¯s time for the girls to fight, wielding an iron machine hand and launching a sparking rocket punch! A spiked ball flying in the air! Attack of the blood-spattering sole corkscrew! There are no rules for this craziest action! Now the bloodiest fight of the deadly girls is about to begin!!