In her second year of marriage, young wife Tsukasa suffers from sexual frustration as her husband loses interest in intimacy. On a whim, he suggests she visit a massage parlor, leading her to step inside. The shop is a corrupt establishment that mixes aphrodisiacs into its oil treatments, and she soon finds herself immersed in forbidden pleasure. Under the drug's powerful effects, her desires surge uncontrollably, driving her to repeated, arched-back orgasms. Keeping it a secret from her husband, Tsukasa continues this lewd affair. Her heart will never return to the way it was.