One of the nine Logismoi Oplo, which are the keys to saving the world from the apocalypse, resides in the body of the girl named Horizon. Toori, chancellor of the aerial city ship Musashi, and the others who rescued her from the Testament Union are on their way to England, an island floating above the Sea of Japan, to request a second Logismoi Oplo. But at the same time, Tres España, which joined with the Oouchi clan and rules the wester Chugoku region, begins taking action in advance of the history recreation of the coming Armada Battle.