Chizuko Azuma struggles to keep her small inn afloat after her husband's passing, managing everything on her own while worrying about finances. Her son, Keisuke, unable to focus on his job, suggests a bold idea: "Mom, if you offer soap play services to guests, we'll definitely make more money." Agreeing to the proposal, Chizuko begins offering the new service—with Keisuke becoming her very first customer.