A Powerful Duke In Another world

Sorai Hiroto, a 24-year-old guy was killed in a road accident. Meeting the god and having too much regret on himself, God Origin grants him another life. He now has to start in a cliche isekai novel like starting and vows to live a life he wanted with all his childhood fantasies that became a reality in this new world. Lyon Purgarian, a 13-year-old child who became a duke after his father's death is killed by the most unexpected foe, his aunt. Our protagonist gets reincarnated in his body to continue living as Lyon. Can he enjoy his life like he vowed or he would end up having regrets in this life as well?