In 2100, newly constructed Bayside City is Japan's premier international port. A former policewoman named Takako founds Angel Arms — a private security company equipped with powered combat suits — to fight terrorism in the city. When the mayor is assassinated, Angel Arms finds itself protecting the crime lord Hassan, whose intelligence is the only available lead on the global terror ring behind the killing. As criminals plot Hassan's death and the pressure mounts, the revelation arrives that the terror organization's leader is the former lover of Angel Arms operative Alisa.