Ryoko Rinne, a tall, fair-skinned, big-titted apprentice at a massage clinic, begins experiencing strange sensations and intense pleasure after her master secretly stimulates a hidden erogenous zone known as the "female spring hole." Possessing a stunning figure, she overwhelms viewers with realistic squirting and pissing scenes throughout the film. As her secret spot is stimulated, she pleasures her aching pussy and loses control during rough sex with a perverted client. She dominates a submissive male coworker in a sadistic, reverse-massage session, climaxing with involuntary urination. The clinic setting also features a wild threesome, where she repeatedly gushes urine in powerful, relentless streams.