In the steampunk world of Prestale, vast airships and fleets of planes clash high above the ground as two kingdoms fight an endless war. Claus and Levie are two pilots caught up in this war after they take on a mission to deliver a young girl to the airship Silvana, only to be betrayed at the last minute. This Japanese anime series features combined hand-drawn and digital animation, and is directed by Koichi Chigira.