sla, a flying island, is about to leave for the "end of the sky". At the sailing ceremony, there was Karuel, an apprentice as an aviator. Contrary to the atmosphere of the gorgeous ceremony, Karuel's eyes, which fly the air plane, were hated by Provincial Superior Nina Viento of Isla.

Knights were among the first to discover a fleet of empty clans that "unconditionally attack anything that enters the Holy Spring ." The old-fashioned wooden destroyer fleet is scary, and Leopold is annihilated with all his might. Around that time, Chiharu and Mitsuo, who were scouting the rear airspace, discovered an enemy super-large bomber ...