The story of a certain son. Due to renovations being made to their house, Yasuhiro Shiomi and his mother, Yuriko Shiomi, are staying with their aunt, Shinobu Igarashi, who is also their sister. They are renting a room in the home of their cousin, Tatsuo Igarashi, who is attending university in Tokyo and living alone. Still, since it's not their own home, they feel somewhat uneasy. Perhaps Yuriko, the mother, also feels like she's renting out the house...