Chasing a series of missing detective cases, young female investigator Rei Aino uncovers the shadow of the notorious Black Lion Society behind the mysterious disappearances of her seniors and colleagues. Ignoring her superior's order prohibiting solo investigations, she infiltrates the enemy's hideout based on intelligence gathered from a junior officer. However, the location is not merely a hideout—it's a carefully laid trap. Drugged and overpowered, she is forced into humiliating acts captured on camera. Proud and strong-willed as a narcotics investigator, Rei Aino's mental defenses begin to crumble under relentless attacks, endless torture, and inescapable demonic assaults that push her beyond reason.