Nejimaki Seirei Senki: Tenkyou no Alderamin

Ikta Solork wants little from life beyond sleep and freedom from responsibility, but war between the Katjvarna Empire and the Republic of Kioka pushes him toward a military career he never wanted. While traveling to an officer examination with his childhood friend Yatori and several new companions, their ship sinks and leaves them in enemy territory, where they rescue the empire's captured princess.

Their reward is the prestigious title of Imperial Knight and immediate proximity to the front lines. Beneath Ikta's laziness is a rare strategic mind, and the more he avoids becoming a hero, the more often he must use that mind to save soldiers from commanders who understand war less clearly than he does.