Two years after losing her husband in a traffic accident, Aya regretfully found herself making love with her son Katsuya in front of her husband's funeral portrait. Vowing never to repeat the same mistake again, she resolved to keep her distance. Katsuya dreams of becoming a doctor, so Aya asks her brother-in-law, Takao, for financial support. However, Takao demands her body in exchange for his help. For the sake of her son's future, Aya reluctantly enters a physical relationship with Takao, struggling internally with hidden emotions and conflict, yet persevering with strong determination. One day, when a drunken Takao shows up at her house, Aya's vow quickly crumbles, sparking a whirlwind of new emotions. That single moment of choice brings a profound change to Aya's life.