Elf Tensei kara no Cheat Kenkokuki  

A magician with extraordinary abilities sought to defy the inevitability of aging by utilizing the power of magic to reincarnate and maintain control over his own fate. This process was repeated multiple times until the magician's 31st incarnation, where he emerged as a young boy named Cyril living in an elven village ruled by humans. Despite their oppression, Cyril used his past knowledge and experience to help Lucie, a childhood friend, when she faced difficulties. This story serves as the foundation for the creation of an ideal nation that promotes harmony among all races.