Bouken Ou Beet

During a time known as the Century of Darkness, monstrous Vandels dominate the world, and only the Vandel Busters can oppose them. After a group of Busters is killed in combat, they transfer their magical Saiga weapons to Beet, who becomes the most powerful Buster. Beet does not merely intend to fight the Vandels—he aims to eliminate them and put an end to the Century of Darkness.