The Fallen Brother is Actually the Strongest-the Strongest Hero in History is Reincarnated and Unknowingly Unmatched at the School-

Story:

A brief description of the manga The Fallen Brother is Actually the Strongest-the Strongest Hero in History is Reincarnated and Unknowingly Unmatched at the School- Eugene, a hero, is forcibly reincarnated by the demon king Venomzard. In a world far in the future, he becomes a noble boy named Julius. Freed from his "hero" mission, Julius decides to enjoy his second life and his school life. However, his brother, Gaias, mocks him, and his parents and teachers consider him a failure. Having been reincarnated with the immense power of his previous life, Julius unknowingly becomes a warrior …!