Manga Mannen D-Rank No Chuunen Boukensha, Yotta Ikioi De Densetsu No Ken Wo Hikkonuku

Lucas's life is definitely not easy. Due to failures in the past, his health suffered greatly, he became old and crippled. However, his life changes dramatically when he manages to pull the magic sword out of the stone, as now he is young and handsome again, and also received tremendous strength. He is faced with a responsible task - victory over evil, and then a happy ending with his own harem.
He desperately rushed to achieve this goal, because he was always an ambitious guy.