Ten years after losing her husband, Sayaka raised her son Masaki all on her own. When Masaki graduates from college, Sayaka meets a sincere and kind man named Okawa through a friend's introduction. Drawn to his warmth, she begins considering remarriage and decides to invite Masaki on a hot spring trip to share her feelings. As she takes this first step toward building a new future for their family, what emotions will stir within her?