Is Love Sustainable?

Sawada Kyoka is a yoga instructor with a rough personality and constantly fights with her father after her mother passed away. Due to having to spend the time taking care of her father, Kyoka doesn't have much time for herself and has very little desire to get married. Meanwhile, Sawada Rintaro is Kyoka's father and works as a freelance lexicographer. After the passing of his wife, Rintaro hasn't been living well which frustrates Kyoka. One day, Rintaro decides to find his second life partner and wants to start a "double marriage life" with Kyoka.