So, I'd watched Konosuba's adaptation last year. Took waaaaay longer than it should've, I'll admit. I do know there's an adaptation for this. I've seen a couple episodes so far, and it gave me less laughs than the main series did in that short amount of time, but I am planning to watch the rest of it soon. That being said, I already owned this complete series (still don't have the complete main series but am working on getting them as we speak. I currently have half of those, but I figured since this one is about my favorite character from the anime, Megumin, and it's apparently a prequel, I was going to read this first).
The light novel did give me more laughs than the episodes did, even covering the parts of the anime that I had watched. It also looks like the anime adaptation of this does take some creative liberties (I am fine with the differences I'd seen in the first two episodes though).
What I like about this first light novel especially is it gives us Megumin's reasons to want a type of magic that was made clear in the main series to be pretty much useless. And honestly, her reason is understandable. I also like her friendship ("rivalship?") with Yunyun in this story, and the moments when they butt heads against each other. It felt very real. We've all had friends we can be that way with, I'm sure. I also like how Bukkororii, who I hated due to how creepy he was after a bit, ended up with no one shown on that crystal ball, which implies he'll end up alone (though it is kind of hinted it might be for a different reason? Maybe he gets better later on? Not sure). Gave me a laugh since I didn't like the guy though.
The artwork was also fairly well drawn, though I typically expect that with Japanese light novels. I liked how some pages were drawn like manga pages. I'm not a big "comics" guy myself, but I can appreciate that at least.
My favorite character in this first light novel might've been Komekko though. She was somehow the most capable character of really doing anything in the light novel, and being her age, that makes it a lot funnier in my opinion. Plus, it's really hard to make the younger sister of your favorite character overall to not be likable. Overall, this first one was great. Planning to start reading the second one today!