Rin raised Masaharu on her own, and now he has entered university and reached adulthood. With motherhood nearing its end, Rin feels a new chapter of her life beginning. Around this time, she meets a man from Tochigi through work—a sincere and kind man named Okawa. Despite their age difference, Rin finds herself drawn to him. After a long-distance relationship, they begin considering remarriage. Planning a warm hot spring trip, Rin invites Masaharu and heads deep into the mountains of Tochigi. During the journey, Rin begins to realize Masaharu's true feelings for her...