Raidorl Seiken Senki

Born as the second prince of the Kingdom of Zain, Raidor became the owner of Dahinslave, the "cursed holy sword," one of the twelve holy swords said to exist on earth. However, his older brother, Prince Granard, fears him as a rival to the throne, and banishes him to a remote region. After living a life of poverty and hardship while fighting demons, Raidor is called back to the capital. Granard needs his help to protect the kingdom from invasion. Raidor, angered and disgusted by his brother's order, ostensibly obeys, but secretly decides to rebel! The holder of the other holy swords and the betrayal of others nobles come one after another. Will Raidor be able to take his revenge by overcoming all the challenges ahead? (Source: Ichijinsha, translated)