Wife Nozomi lives happily with her husband, Takayuki, a practicing physician. When Takayuki travels to Osaka for work, leaving Nozomi alone with her father-in-law, Kozo—a former doctor—the two are left alone together. Nozomi falls ill, and Kozo uses her condition as an excuse to "examine" her, touching her under the guise of medical treatment. What begins as a fake examination quickly turns into something far more erotic. Innocent and naive, Nozomi gradually surrenders her body to Kozo. The erotic "treatment" intensifies, giving rise to a forbidden new relationship...