Nonoka Saki visits an esthetic salon, only to find it's an illegal establishment that takes advantage of women's vulnerabilities to perform obscene, insidious, and ruthless "underground" massages... Between the aphrodisiacs she drinks and the ones applied to her skin, she absorbs them from both sides, and her consciousness gradually turns erotic. By the time she realizes something is wrong, it's already too late. Her private parts are carefully stroked along the edges, forcing love juice to overflow from deep inside her vagina, and she is driven to a climax so intense it feels like she's going crazy...