It is 2032, seven years after the Second Great Kanto Earthquake devastated Tokyo. The city has been reborn as MegaTokyo, constructed by mechanical beasts called "Boomers." Initially designed to serve humanity, the enigmatic corporation Genom now manufactures Boomers with immense destructive capabilities, serving as a new form of advanced weaponry that can disguise itself as humans. The AD Police is a specialized unit established to combat the rising tide of Boomer-related crimes. Overwhelmed by the volume of offenses and the disparity in power, the AD Police offers little resistance to the Boomers. A mysterious vigilante group known as the Knight Sabers, equipped with powersuits superior to military technology, stands as the citizens' sole hope for protection. Led by Sylia Stingray, Priscilla "Priss" Asagiri, Nene Romanova, and Linna Yamazaki, these attractive women eliminate any Boomer that violates the rules.