Kal-El Albus and his younger sister, Ariel are preparing to enter Cadoque's High Aerial Division to train to become military pilots. The high school is located on the flying island known as Isla, where an alliance of three different nations (Kingdom of Qi, Balsteros Republic, and Bentares) hope to commandeer the island and learn more about the prophesied End of the Sky, which are rumored to reveal the secrets about the creation of their world by the god Saint Aldista. After being assigned to their dorms, Kal-El is taking a stroll on the island when he runs into a girl who is having trouble with her bike...