Rendan plot
Shotaro and Minako's marriage is on the rocks. Minako has admitted that she is unfaithful to her husband and indicates that she wants to leave him. She has had enough of her submissive husband. Minako has a successful career at a construction company, while her husband takes care of the children as a househusband. The two keep arguing until Minako finally files for divorce. The eldest doctor Mari is not bothered by the upcoming divorce of her parents because she has her head full of a piece of music that she will have to play together with her mother during the concert of the music school. She is also madly in love with her music teacher. Younger brother Toru feels betrayed by his mother and is ashamed of his father.