In a near-future world where rising sea levels have submerged much of civilization, high school student Ikaruga Natsuki has lost almost everything. After an accident claimed his leg and his will to dream, he returns to his quiet, half-sunken hometown. His oceanographer grandmother left him her submarine and a large debt, tasking him with finding her sunken treasure.
Instead of riches, Natsuki discovers Atri, a mysterious and highly advanced android girl who has been asleep in an underwater casket. She looks and acts almost perfectly human. As they begin a new life together, their unforgettable summer is filled with recovering lost memories and discovering what it truly means to have a heart. This touching sci-fi romance series on Tokyo MX has ended, but sign up for a reminder just in case it returns.