Masashi is a 5th-grade student in elementary school. His family consists of his father, Masato; his mother, Kiyoko; younger brother, Shigeri; younger sister, Reiko; and his grandmother, En. His father, Masato, works as a timber broker. Their family lives in a large house in Nagasaki. For the first time, Masato tells his son that he can have a birthday party at their home. Masashi is completely thrilled, but Masato and Kiyoko know that this will also be Masashi's last birthday party at their home. Masato's financial situation has collapsed. Masashi does have his birthday party with friends at his home, but on that night, Masato informs his family that he will move. ~~ Adapted from the novel "Kasutira" by Masashi Sada.