Seeing MC as a trap in the end I started to think: what is his endgame? At the moment he performs the job of a demon. It's not that I am implying being dressed as trap is a job of a demon... Wait, I was sidetracked. I mean, I never heared any talk about what will happen to executor eventually. And no word of reward other then freeing himself from sinners in his proximity. Is he oni-vigilante? I guess he does it by his own will at this moment, but he was coerced into it in the beginning.