While caring for her husband's mother, wife Ririka becomes enraged by the sudden appearance of her brother-in-law, Takanobu, and his demands for inheritance division, forcing them into conflict. To Ririka, who has spent years tending to her mother-in-law, Takanobu's attitude is unforgivable, escalating their dispute. Takanobu begins harassing Ririka, and their relationship gradually turns sexual. Entangled in family tensions and overwhelming emotions, what choice will Ririka ultimately be forced to make? The story portrays a woman torn in the midst of emotional turmoil.