Having once fled from their alcoholic father, Kimiko and her son Hiroaki spent their days together in a quiet hot spring town. Upon hearing news that the town is about to be submerged due to dam construction, they decide to visit one final time. Holding onto memories of the past, they return to the inn at the heart of the town—the very place where, long ago, they once filled their emotional void with a single, forbidden physical encounter. Amid the tranquil scenery of the fading resort town and the resurgence of buried feelings, their emotions begin to stir once again.