Jun, a gravure model, comes to a salon without knowing that its selling point is its "sexual development program." Despite the suspicious explanation and embarrassing questionnaire, she decides to undergo the treatment, hoping for some results... Before she knows it, her whole body is covered in oil and her sensitive body is massaged, and even her erogenous zones, such as her breasts and genitals, are stimulated with the suspicious oil, forcing her to develop sexual sensitivity. She loses consciousness from the excessive pleasure and loses all reason! Eventually, she asks for the next program. She squirts violently, arches her back violently, and cums violently! The increasingly escalating erotic drainage program pushes Jun beyond her limits...