Centered on the conflict between two contrasting sisters and their mother. The older sister, Yoko, is engrossed in a fleeting affair with a man she met through a dating app, while the younger sister, Kaori, has a happy marriage and a successful career. When their mother, Kiyoko, grows increasingly dissatisfied with their workaholic father, Kenji, and runs away from home, the relationships between the sisters, the family, and the couple begin to change drastically...