This work documents the real training sessions of genuine female masochists who volunteered for discipline at the SM secret circle "Slave Club." Featuring dominator Ranki Kazami, this club delivers extreme, cruel torments far beyond what other SM circles offer. The subject this time, "cattle OL Kumiko," is a true-born masochist lent to Slave Club by her owner—a fetishist man who raised her as a submissive female pet. Despite her innocent, youthful appearance, she possesses an abnormal libido consumed by the pleasure of suffering, thoroughly trained into a real-life masochist. Her owner's request was explicit: "Use her not just as a toy or a sexual toilet, but fulfill her obsession with suffering through brutal, inhumane torture." Responding to this demand, the club members relentlessly torment her one after another, driven by raw lust, dragging the girl into the blurred boundary between agony and ecstasy. This release compiles the most severe and punishing scenes from multiple training sessions, delivering an authentic, unparalleled SM experience unlike anything else.