38-year-old milf Reika (temporary name) is in her second year of marriage with no children. After 13 years of dating and now married, her relationship with her husband has grown stagnant—due to their age difference, their sex life has diminished, leaving her unfulfilled as a married woman. Feeling anxious, she thinks, "If I don't take action… I'll end up losing my femininity without ever experiencing anything," and decides to embark on a trip with a man other than her husband. In truth, she is a submissive woman who secretly desires to be dominated and roughly taken by a man. To unleash this passion on a complete stranger, she greedily pursues pleasure at a hot spring inn. As a result, she is intensely dominated and completely loses control. This two-day, one-night journey to satisfy her desires as a mature wife will bring a profound change to her life.