Hinako Matsui, a married woman suffering from a sexless marriage, reaches her breaking point and seeks relief at a mysterious sensual oil massage parlor. After drinking a strange herbal beverage, she enters the shower room where her groin begins to heat up, pulsing with a tingling, painful sensation. Though shy at first, she gradually succumbs to a mix of humiliation and stimulation as the masseur's hands work over her body. Drenched in oil, her body twitches violently with each movement of his fingers, sending electric jolts through her. Forced to drink another suspicious concoction, she loses all control. Her eyes lock onto the masseur's erect cock; drooling uncontrollably, she can't resist as he thrusts into her, immediately triggering an arched-back convulsion. She erupts in a massive, ceiling-high oral and urinary spray, climaxing repeatedly until her expression reflects not just ecstasy, but sheer terror.