Hazure Skill The Guild Member With A Worthless Skill Is Actually A Legendary Assassin (Manga) Vol 01 (Mature)

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... Yen Press
(W) Kennoji (A) Fuh Araki, Kwkm