Our Last Crusade or the Rise of a New World Novel Volume 3 was written by Kei Sazane with illustrations by Ao Nekonabe.

Tasked with a special mission from the Saint Disciple Risya to infiltrate the Sovereignty, Iska finds himself breaking off from his platoon after an accident he didn't bargain for. With Alice assigned to spy on him nearby, the seemingly incompatible duo manage to get a glimpse of what lies deep in each other's hearts.