Page 16: MC; "I'm sorry for erasing important proofs"
This sentence alone defines very well what's wrong with this character.
He's so submissive/apologetic, though he's the strongest person in that place, and saying idiotic stuff like that, even though everyone should worship him, for killing a demon.
This manga can be so frustrating to read, since this MC is shamefully retarded, when he's supposed be a sage (from previous life)
You can't have it both ways. It's either an idiot, or sage.. Then again, it's clear by now, that the sage thing is just an excuse for this retard to pull out any Deus-ex spell from his ass, when he's in a tight spot