Tensei Kenja no Yarinaoshi ~Ore Dake Tsukaeru Kikaku-gai Mahou de Nidome no Jinsei wo Musou suru~

Once, there was a great sage who sought power and became the strongest in the world. He faced the Demon Lord in a final battle to claim the title of the strongest... but the Demon Lord escaped using reincarnation magic. To settle the score, the sage also used reincarnation magic to follow. However- "As a man, you won't be able to use magic."