After dating for a year, Hiroshi finally visited his girlfriend's parents' house and met her mother. A kind, hardworking, and beautiful woman who had raised her daughter alone as a single mother, she made a strong impression on him. Coincidentally, that day was also the mother's birthday, and Hiroshi ended up celebrating the special occasion together with the girlfriend and her mom. The conversation flowed easily, and thanks to the mother's warm hospitality, Hiroshi was invited to spend the night at their home.