Hiroshi visited his girlfriend's home, where they had been dating for a year, and there he greeted her for the first time with her beautiful, kind, and hard-working mother, who said she had raised her daughter by herself in a single-parent household. - When I heard about it, I found out that it was her mother's birthday or something, and that night, Hiroshi and her mother joined her for the birthday celebration. - As the story goes, with the kindness of his mother, Hiroshi ends up staying at her house that night...