Sumire desperately raised Kota as a single mother.Thanks to his desperate efforts to raise him, Kota successfully graduated from university and got a job.When Kota started living alone, Sumire looked back on her life.I'm happy that Kota left the nest fine, but what about my life?One day she was invited to a hot spring trip by Kota.Sumire, who is worried about her own life, and Kota, who is optimistic and doesn't care about her own father, start a hot spring trip.