A beautiful girl, Rio Sakamoto, wanders the city searching for her companions who have been disappearing one after another. Exhausted and at a dead end in her search, Rio receives a message from one of her missing friends. Unaware it's a trap, she summons her courage and storms the Black Lion Society's office alone to rescue them. There, the men force her to drink a beverage laced with a powerful aphrodisiac, causing her to lose consciousness. When Rio wakes up, she finds herself bound and awaiting a hell of pleasure torture and forced orgasms. Toyed with by wicked men, her entire body becomes hypersensitive, and both her pussy and anal hole are driven to constant climax. Rio tries desperately to resist, but her dormant female instincts are awakened, and both her body and mind fall into a pleasure beyond imagination. What will be the fate of the pretty warrior Rio in the face of the strongest pleasure torture in history?