Saiteihen no Osssan Boukensha

Adventurer Lewis is nearing 40 and still stuck at E-Rank. Mocked by his guild as the “Immovable E,” he’s become something of a laughingstock. One day, while fighting with his life on the line, Lewis manages to defeat a monster far above his level. As a result, his level increases for the first time in his life, and he awakens a new skill—the legendary “Unconditional Victory,” once wielded by a hero of old. What exactly is the true nature of this skill that can mow down massive enemies with a single blow…!?