I Became a Legend After My 10 Year-Long Last Stand.

With a demon army closing in, Luck Lock Franzen tells his friends to go on ahead while he holds them off. Standard heroic last stand stuff. Except he doesn't die. He just keeps fighting — no sleep, no rest, sword clashing and blood raining for what feels like a long battle but turns out to be ten straight years. When he finally kills the demon commander and walks out, he's somehow de-aged into a teenager, and the world has moved on without him. His name is carved into statues. He's a legend. And all he wants is to lay low. So he slaps on a fake name, registers as a rookie adventurer, and tries to live quietly in a world that won't stop reminding him he's supposed to be dead. The fun here is watching an absurdly overpowered guy who can learn and copy enemy magic trying to blend in as a beginner, while the gap between his reputation and his teenage appearance keeps causing problems. There's solid action when fights break out, but the comedy of Luck navigating his own fame and a society that changed while he was gone gives it a lighter edge. This TV series from Studio Gekkou adapts the light novel and airs in 2026. If you liked the OP protagonist energy of Overlord or the isekai-adjacent time displacement vibes of Re:Zero, this scratches a similar itch. Fans of The Rising of the Shield Hero's underdog-turned-legend arc will also find something to latch onto here.