The story of a certain son. For the renovation of their home, Yasuhiro Ushimi and his mother, Yuriko Ushimi, are living at the house of Yuriko's real sister, Shinobu Igara. They are staying in the room of Tatsuo Igara, their cousin who lives alone while attending a university in Tokyo. However, no matter how you look at it, it's not their own home, so they can't help but feel uneasy. Yuriko also seems to be aware that she is living in someone else's house, and she diligently handles all the household chores without rest… And as Yasuhiro watches her, he finally realizes… He has started to see his mother, who lost her husband and is now alone, not just as a parent but also as a woman, in a sexual way.
