I lost my father when I was little, and I have lived alone with my mother for a long time. Although it was sometimes tough, I started to love my beautiful and kind mother as a woman. But after my employment, her mother seems to be remarried to a man she met at her workplace and trying to live her second life ... One day, I invited her mother to a hot spring trip with her parents and children as a celebration of her premarital marriage. To convey "future love" instead of "gratitude so far" ...