Densetsu no Yuusha no Densetsu

After getting dragged into a war and losing many of his friends, Ryner, a lethargic Roland Empire student, is asked by the soon-to-be enthroned king, Zion Astal, to help rebuild Roland postwar by searching for legendary relics. Accompanying him is a beautiful, capable, yet arrogant swordswoman named Ferris Eris, who’s always quick to insult and abuse Ryner. Meanwhile, a new turmoil begins to approach Roland.