With Earth seemingly entangled in endless war, it is hard to believe that the city of Olympus has attained a utopian society. This peaceful haven is made possible through its population, which consists predominantly of Bioroids—genetically engineered humans who can no longer reproduce on their own or experience extreme emotions. Deunan Knute is a legendary soldier who has been fighting in the wastelands for as long as she can remember. When Hitomi, a representative of Olympus, scouts her to join their security force, Deunan is skeptical that there can truly be a place so calm. Proving her suspicions correct, Deunan soon learns of a dangerous plot that promises to plunge the city into chaos—by threatening the very existence of Bioroids.