Four sisters from the Takezawa Family gather for the first time in a long while upon learning their seventy-year-old father has a mistress and a love child. The quartet decides against letting their old mother know about it, and takes the opportunity to reveal their own problems to each other.
The oldest sister, Tsunako, has been having an affair while the second oldest, Makiko, knows her husband has a younger girlfriend. The third sister, Takiko, is painfully shy, and the youngest, Sakiko, got married to a struggling boxer after finding out she was pregnant. One day, Makiko unexpectedly sees the mother standing silently in front of the mistress’s house, staring at the door. What happens next? Later, the sisters find a letter their late mother wrote long ago to a newspaper.