A certain son's story. His son, Yasuhiro Sawamura, and his mother, Reiko Sawamura, are staying with his aunt, Sorami Haga, who is his younger sister, to renovate their house. His cousin, Tatsuo Haga, who goes to university in Tokyo and lives alone, is renting a room at his parents' house. However, it's not my own house, so I'm somewhat restless. Her mother, Reiko, is also aware that she is still living on her loan, and she does her best to do the housework without taking a break. While looking at Reiko like that, Yasuhiro finally noticed... That her mother's bra is floating...
