Earth in 2087, where the existing order collapsed due to two disasters. Tae-oh, a janitor, lives on a small island that was created when a large city sank. One day, an unidentified intruder makes an emergency landing and unintentionally fights as a team with Yana, who has been an enemy for 10 years. Tae-oh, who has developed camaraderie overnight, gradually gets caught up in incidents with Yana...