Densetsu no Yuusha no Densetsu
Ryner Lute is a lazy student of the Roland Empire Royal Magician's School. One day, the Roland Empire goes to war against a neighboring country Estabul, and Ryner loses his classmates in the battle. After the war, at Emperor Sion Astarl's command, Ryner sets out on a journey to find the relics of a "Legendary Hero". During his quest, he finds out that a deadly curse is spreading across the continent.
(Source: Anime News Network)