Saikyou Onmyouji no Isekai Tenseiki

Saikyou Onmyouji no Isekai Tenseiki follows Haruyoshi Kuga, a prodigy who once stood at the pinnacle of exorcists but still wanted more power. That ambition turns him into a target for the people who envy his talent, and in his final moments he casts a spell that sends him into another life, hoping to return with a sharper mind and a more cautious heart. He is reborn as Seika Lamprogue, the illegitimate son of a noble house that prides itself on magical bloodlines. Expected to fall short because of his low status and the talent his new family values, Seika is mostly ignored. Instead of wasting his second chance, he uses the knowledge Haruyoshi carried from his former world to study the people around him, win allies, and quietly test the limits of his new abilities. As Seika adapts to a world shaped by magic, privilege, and reputation, Saikyou Onmyouji no Isekai Tenseiki becomes a story of survival, restraint, and slow-earned power. He has a chance to build a life that the first Haruyoshi never could, but only if he keeps the promise not to repeat the mistakes that ended his previous one.