Densetsu no Yuusha no Densetsu - MangaDex

A mythical story with swords and magic centering around one lethargic Roland Empire student named Ryner Lute. After getting dragged into a war and losing many of his friends, Ryner 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.

Mag Talk - Monthly Shonen Magazine, Shonen Sirius - (Kodansha), Page 6

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Densetsu no Yuusha no Densetsu - MangaDex