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

The sorcerer Luck believes this to be the end. Besieged by powerful demons, he makes the noble sacrifice of holding back their onslaught while his friends escape. Never sleeping or resting, Luck endures the clash of swords, rain of blood, and never-ending stream of enemies. Against all odds, he vanquishes the commander and emerges victorious, only to find that 10 whole years have passed in the meantime. Furthermore, his body has regressed in age to the point where he looks like a mere teenager. ...