46-year-old madam Ren lives in Musashino. Married for 18 years to a husband three years her senior, she has two children—a 13-year-old daughter and an 11-year-old son—and a 70-year-old mother. On the surface, her family appears happy, but in reality, it's on the verge of collapse due to her husband's infidelity and their sexless marriage. Her husband has been having an affair with a 23-year-old married woman without children at his workplace, which led to his demotion when discovered. To seek revenge, madam Ren has started taking sex partners and staying out overnight. Though she knows it's wrong as a wife, her anger refuses to subside. How will her pain and desire for revenge unfold from here?