Koko wa Ore ni Makasete Saki ni Ike to Ittekara 10-nen ga Tattara Densetsu ni Natteita.

S-rank mage Luck sacrifices everything to defeat the Demon King. Returning ten years later to a world that mourns him as a dead legend, he hides his identity and starts over as "Lock," an F-rank adventurer building a new life from scratch.