Okay, so Konosuba became my favorite series, and I havent quite finished it all yet but I love it. In terms of story.. well its story is just your average isekai tbh, but the point of this is not for the story its about the characters and enjoyment of the series. Konosuba feels like your hanging out with your friends just joking around and making memories, you aren't reading this to follow an amazing story you read it because its fun, relaxing, memorable, enjoyable, and light hearted. The MC is not your average isekai goody two shoes heart of gold guy, he isn't evil whatKazuma is is relatable.
There is some romance, but its slow, there is character development but its slow because its about the comedy and the memories the characters make together.
I extremely recommend this! I love this, it is my favorite anime and manga and it is 100% worth a read or a watch. Just give it a chance.