This anime series follows Yorn, a young man who's always been captivated by two mysterious floating cities, the "Edens." But when assassins from Eden murder his father and Yorn learns he may be next, he realizes the cities are far from idyllic. With the help of two enigmatic allies, Yorn goes on a quest to find his long-vanished mother and learn the secrets of his family. Meanwhile, he must elude the evil overlords who want him dead.