The fallen brother is actually the strongest-the strongest hero in history is reincarnated and unknowingly unmatched at the school-

Ochikobore Datta Ani Ga Jitsuha Saikyou: Shijou Saikyou No Yuusha Wa Tensei-shi, Gakuen De Mujikaku Ni Musou Suru mamnga, The fallen brother is actually the strongest-the strongest hero in history is reincarnated and unknowingly unmatched at the school- , 落ちこぼれだった兄が実は最強 ～史上最強の勇者は転生し、学園で無自覚に無双する～

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 …!