One year after her mother-in-law passed away, her husband Kakki and his wife Towa came to their parents' house, worried about their father-in-law Toru, who could no longer hide his age.Towa is a childhood friend of Ikki and has been acquainted with Towa since childhood, and he thought of her as her daughter, but Towa had a special feeling for Towa.It's been going on since Towa's firefighter, Toru, saved his life long ago.And when she reveals her feelings to Toru, who has become single, boldly asks for a kiss, and becomes lustful, Toru is gradually attracted to him.