The Great Sage who got Exiled to the Frontier for 50 Years, Regains His Youth and Starts a Second Legend

Henkyou ni Tsuihou Sarete Gojuu-nen no Daikenja wa Wakagaeri, Nidome no Eiyuu Densetsu ga Hajimaru

Summary:
The hero Marik Galliard, who once repelled the Demon King’s army, is betrayed by his comrade Lienus, who is jealous of his fame, has his magic sealed, and is exiled to the frontier. Fifty years pass in a remote village, and the now-elderly Marik is visited by Lienus’s granddaughter, a girl named Reyes, who offers both an apology and to lift the sealing spell. Accepting her feelings, Marik regains his magic and youth, but the price is that Reyes turns to stone and becomes a statue. To undo Reyes’s petrification, Marik resolves to set out on a journey with his disciple Alicia. At the same time, the Demon King’s army is resurrected and preparing a counterattack against humanity… and Marik’s adventures and unstoppable exploits begin once more