My rating is very biased as i love this manga personally. I will try to help you to decide either to read or skip this manga. In general, story is pretty lame for a someone who is looking for out of the box. You should avoid this manga if you want dominating OP MC or cultivation. This manga is about a character wise normal guy who have lot of magic capacity and ended up making contract with a older demon girl (reason is clarified in manga).MC is not weak and main girl is also very powerful. Plot revolves around their wholesome and comedic interactions intypical fantasy school setting.

Multiple girls are interested in MC so it does have harem, but it's majorly for fan service and comedy.

I does gives onee shota vibes, so decide accordingly.

I have rated it 10 because i would love to have someone like Vermeil (demon girl) in my life, hence biased.