Gravure model Rin arrives at a beauty salon unaware that its selling point is its "erogenous development program." Despite the suspicious explanation and embarrassing questionnaire, she decides to undergo the treatment, hoping for results... Before she knows it, her entire body is covered in oil, her sensitive body is massaged, and even her erogenous zones, her breasts and genitals, are stimulated with powerful aphrodisiac oil, forcibly developing her sexual sensitivity. The pleasure is so intense that she loses consciousness and loses her reason! Eventually, she finds herself asking for the next program. Rin learns to orgasm by rubbing a penis against her G-spot while leaning back! The escalating erotic drainage program pushes her limits...