It's been six months after the triumphant Battle of Britannia and the liberation of Gallia from the Neuroi invaders. Yoshika Miyafuji, a member of the 501st Joint Fighter Wing, has returned to Fuso and completed his middle school education. Her battle, though, is far from done. She receives a letter purportedly from her long-deceased father, which contains schematics for a cutting-edge Striker Unit he was working on before his death. Yoshika's unique magical abilities may be able to be harnessed by the Unit, which was created expressly for her.