International crime investigator Ritsuki Hazuki pulls the trigger with a sorrowful expression. As her bullet takes the target's life, she herself feels a powerful shock throughout her body, losing her vision. She then finds her limbs bound to a sofa, surrounded by masked men. Subjected to quiet yet meticulous fondling, Hazuki is forced to endure unbearable humiliation. Repeatedly made to climax against her will, her mind on the verge of breaking, an unbelievable sight suddenly unfolds before her eyes. A fully armed heroine appears in front of her and silently runs off. Hazuki senses something—this woman was an unknown agent from a special task force. Koya Kozuki, clad in the special gear known as "Gades," was fighting against unknown, bizarre creatures. There, an unexpected turn of events awaited.