The story revolves around Raina Ryūto, an apathetic student who always dozes off at the Roland Imperial Special Academy. One day, Raina and his classmates get caught in the war waged by the opposing Kingdom of Esutabūru, and he loses many friends. After the battle, Raina goes on a quest on behalf of the Roland Empire and Emperor Shion Asutaaru, even as the darkness that has enveloped the land has begun to consume the empire.