Ryoko, having divorced her lazy husband, lived alone with her son. One day, introduced by an acquaintance, she decides to remarry. However, her new husband's son, Takuya, has long harbored secret desires for Ryoko and sees her as a woman. Shaken by the remarriage, Takuya struggles with his growing feelings for his new stepmother. Her new husband is absorbed in work, selfish in bed, and takes her whenever he pleases without regard for her needs. Seeking relief from this unsatisfying life, Ryoko begins to masturbate—but Takuya soon discovers her secret.