Investigator Yuna launches an investigation into a missing persons case. Growing increasingly frustrated as her comrades become involved, she uncovers a lead linking the mastermind to the notorious criminal organization "Kuroshikai," pushing her deeper into the case. However, she is suddenly captured, restrained, and her body is violated while being forcibly administered the very substance her team was tracking. Subjected to humiliating treatment and an unrelenting barrage of pleasure, her trained body struggles to resist. Despite her desperate endurance, wave after wave of overwhelming ecstasy forces physical reactions. Repeatedly brought to orgasm over and over, Yuna surpasses her limits, driven mad by pleasure, transforming into a sex-crazed monster.