Myne picked a good one this week because I finished one fitting for this topic just yesterday. When I picked up They Don’t Know I’m Too Young for the Adventurer’s Guild I expected a generic isekai and was pleasantly surprised when I got a surprisingly good fantasy novel with great side characters.
Another example would be Zilbagias the Demon Prince: How the Seventh Prince Brought Down the Kingdom. I didn't expect something with such a thought-provoking dilemma. The entire series is basically a fantasy novelization of the Tolley-problem. How many acts of evil are okay to do in the name of saving more in the long run? And how does one live with doing those acts of evil and finds the strength to keep going. How much is too much and where does one draw the line? It's surprisingly thought out and balanced perfectly between asking only surface level questions and going too deep.