After her husband's mother passes away, Miyu is forced to live with her father-in-law, Masahiro. Constantly captivated by Miyu's beauty, Masahiro struggles to suppress his hidden desires. Unaware of his feelings, Miyu continues living a peaceful, happy life—until she reunites with Ohshima, her former lover from before marriage. Ohshima still exudes irresistible charm, and Miyu finds her heart swaying under his seduction. However, this reunion was secretly orchestrated by her father-in-law, who uses Miyu's infidelity as leverage to dominate her body, indulging his desires without restraint. How far will Miyu be driven into submission?