A story about a son. - Due to house renovations, son Yasuhiro Sawamura and mother Reiko Sawamura are staying at the house of their aunt Sorami Haga, who is his younger sister. - She is renting a room at her cousin Tatsuo Haga's parents' house, who went to university in Tokyo and lives alone. - However, it's not my home, so I feel uneasy. - Her mother, Reiko, is probably conscious of the fact that she is living in a rented house, but she does her housework as hard as she can without taking any breaks. - While looking at Reiko like that, Yasuhiro finally realized something... - My mother's bra is floating...