Toshio Suzuoka runs a small metalworking factory in the suburbs. He has a wife, Fumie, and a 10-year-old daughter, Hotaru. They enjoy peaceful days, but Toshio’s acquaintance Kusataro Yasaka appears. Kusataro Yasaka recently served time in prison. Toshio hires Kusataro and lets him stay at his house. Fumie is apprehensive about Kusataro Yasaka, but she warms up to him after seeing him teach their daughter to play the harmonium. 8 years later, Toshio discovers a clue about Kusataro.