MEISHI MURAKAMI

In this fantasy manga, unemployment doesn't mean unhappiness when your skills are unmatchable!Ex, an E-rank adventurer, makes a decision one day after five years of slaving away at the guild. "I'm quitting this job!" Ex was belittled for only being able to use beginner magic, but as it turns out, it had a special trait... Even if people threaten him or ask him to do anything, it's too late for them.
"I'm neeeever gonna work anymore!"