Dr. Katsuragi Makoto, a member of the International Self-Defense Corps WSS, has revived his lover Kagetsu Chloe—paralyzed and limbless from a traffic accident—into a new agent of justice using cutting-edge brainwave-responsive artificial muscles. While she continues to eliminate invading combatants from the Empire Laurel arriving from outer space, her body remains incomplete. One day, a man and a woman emerge from subspace. Known as the "Figaro Slaughter Ensemble," they are a murderous brother-and-sister duo. Their wicked melody feeds on the heroine's sorrow and humiliation. This sinister tune heralds a new, twisted development.