In the missing person case, Investigator Yuuna becomes increasingly frustrated as her comrades are involved... She advances her investigation after grasping information about the mastermind's heinous organization, the Black Lion Society, but to her surprise, she ends up captured. In captivity, her body is tampered with, and she is given the very substance they were pursuing, subjected to humiliation and torment... and then pleasure hell! With her well-trained physique, she fights desperately to endure, but her body reacts to the endless wave of pleasure attacks, causing her to be driven to climax again and again. Overwhelmed by the pleasure, Yuuna surpasses her limits and transforms into a sex monster...
