Hazure Skill: The Guild Member with a Worthless Skill Is Actually a Legendary Assassin Vol. 1 Manga
(W) Kennoji (A) Fuh Araki, KWKM
With a worthless skill, Roland managed to kill the most powerful demon lord that's ever lived. While he could have all the riches in the world, all Roland really wants now is a normal¬†life. Such an unremarkable existence may not come easy to someone so exceptional, however...