Pretty funny story overall, definitely above average. I've read the novel too, at least up until a certain point further into the story than this manga goes. For some reason they decided to split off at the end of the kingdom arc or whatever we should call it at chapter 68 and will be continuing with another mangaka for the following story.
Let me just say straight away that these 12-13 volumes of the manga covers very little of the light novel. It just covers 3 out of the 13 complete novel volumes and in 2 months, all 13 novels have been officially translated (when I read it back then, far less volumes were released and we had to deal with crappy translations), so I'd definitely recommend readers who enjoyed this to jump straight into the LN as you can read the complete story there in high quality.
Now, with that aside, this story is a cut above average and the manga artist was a good one that managed to bring the characters to life, which isn't always the case with adaptations. That 13 volumes cover 3 LN volumes means that they took their time to properly convey the story and pacing instead of rushing like some manga adaptations do, so I'd say you could probably jump straight into light novel volume 4 and continue reading from where this left off, though you might want to read the side stories/skim over the previous volumes to see if there are any chapters that clearly cover things not mentioned before.
I had so much fun that I will do so myself with these new, fancy official translations which ensure quality compared to random rushed fan translations (some fan translations are great but sadly this story wasn't blessed with awesome ones all the way).
What makes this pretty good is that the protagonist, while also having some more annoying japanese protagonist traits, is actually quite different from the norm because he doesn't let everyone walk all over him (even if he wants to avoid conflict) and while he acted like a wuss at the start by refusing to kill anyone, he actually ends up showing that he's capable of growth and that he's not a justice touting sh*thead protagonist that won't start killing when pushed into a corner.
The comedy is the best part and mainly comes from the protagonist's often unhinged actions and his AI companion dissing him.
He's OP but not excessively so, while I don't enjoy the idea that he's only truly OP because of his AI companion instead of his own strength, at least he's decently strong even on his own.
It's not my favorite manga/novel but it's definitely a cut above the average trash the market is saturated with. I recommend it.