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

With no other options, Luck makes the choice to hold the line against the unending demonic hordes alone, to make sure his comrades can escape with their lives. However, through a combination of fortune, skill, and ingenuity, he holds that line for ten straight years, eventually coming out on top single handedly. Now he has to tackle the dilemma of how to occupy himself in a world where he holds a myriad of roles: that of a legend, that of a veteran, and that of a brand new face.
(Source: Comikey)