Hazure Skill "Kage ga Usui" o Motsu Guild Shokuin ga, Jitsu wa Densetsu no Ansatsusha

Assassin Roland "kills" the demon king by himself after he breaks away from his group one day. Roland is given whatever he desires as a reward for his bravery by the monarch, who has returned to the realm with grace. Stunned by his desires—he hasn't considered anything but murdering for years—he recalls that one of his friends told him what she intends to do once evil is vanquished: lead a normal life. Thus, with Laila, the disguised demon king/queen, by his side and his ability to blend in, Roland chooses to lead a - pardon the pun - leisurely existence.