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〜 (Associated Names)

I, Eugene, am the strongest hero in history. After defeating the Demon King, I found myself reborn as Julius, the son of a nobleman. It seems that in this world, I was abandoned by my family as a child with zero magical power. I was compared to my excellent twin brother, cuckolded by my selfish…