The Black Knight Who Lived Twice

The last Black Knight of a fallen ancient kingdom, Serbelgion. Three hundred years later, he opened his eyes to find himself reincarnated as the heir of a marquisate in the empire. “Honestly, don’t you think I’ve earned the right to take it easy now?” He no longer needs status or power. He just wants to push everything onto others and enjoy a carefree noble’s life… But regressors keep appearing, threatening to upend his second life.