Atri: My Dear Moments

Rising seas have swallowed huge stretches of land, and Natsuki Ikaruga returns to his coastal hometown after losing his mother, one leg, and the future he once imagined. With little left besides a submarine and the debts inherited from his oceanographer grandmother, he accepts a suspicious offer from Catherine to search the sunken remains of his grandmother's laboratory for something valuable.

Instead of treasure, Natsuki discovers Atri, an advanced humanoid robot sleeping at the bottom of the sea. She remembers that her former master gave her one final task, but not what that task was, and insists on staying with Natsuki until she can fulfill it. In a town slowly disappearing beneath the water, their shared summer draws together buried memories, abandoned dreams, and a girl whose emotions seem far too real to dismiss as machinery.