Yumiko Endo, 30 years old. Since her mother passed away at 18, she has lived with her stepfather, her mother's remarried husband. To the outside world, they appear to be a modest father-daughter household, but in reality, they are more like a married couple. The two have kept this secret from society, but today, as summer ends and the autumn air thickens, her uncle Jiro, who has come from Tokushima, overhears their secret affair in the next room while he sleeps.