Yes, i like it when i wrong. I thought only the MC and his demon tamer magic that could defeat that sack of shit. I didn't expect the sack of shit being literally demon incarnated.
Now, i hope the author not gonna pull something moronic like "I actually a good person trapped in awful situations. I wish for power, but instead possessed by demon and my real self trapped inside the body forced to watch helplessly as my body do bad thing to other people. Can you forgive me?" Then followed by flashback that showing that sack of shit is actually live way worse than the MC. And the MC just like "OK. We friend now."