Lewis Griffith loved magic ever since he was little, dreaming of the day when he would awaken and become a great 'Mage'. However, this dream is shattered upon the discovery that he was inept, unable to form a mana core, and ever utilize magic. Still, due to his outstanding dedication to the art, he studied magic and developed countless theories and schools. His unique concept revolutionized magic in the world, making him one of the most renowned scholars in history. Surprisingly, he reincarnates after several centuries have passed since his death, once again thrust into the world of magic. Will his second time be different? Or will he be the same Magic theorist he was in the past? The tale of Jared Leonard, formerly known as the Great Sage of Magic, is just beginning.