Housewife Jun visits a spa recommended by her husband as a reward to herself, unaware that it is a predatory operation where a middle-aged therapist exploits women's bodies. He uses drug-laced oil and an invasive massage to make her sweat and stimulate her most sensitive areas. She says stop, but her body cannot resist the pleasure and gradually becomes desperately aroused. Convulsing orgasms make her lose bladder control and squirt repeatedly with her eyes rolled back, tongue out, and a dazed orgasm face. Turned hypersensitive from head to toe, Jun secretly returns behind her husband's back until she becomes openly consumed by lust, screaming lewdly and spraying fluid whenever she climaxes.