The story is about a real life OP character (in various ways) who ends up reincarnated & adding magic to the mix. This makes interesting to me because many MP's in this scenario tend to use half-baked notions & product ideas & I tend to feel that they don't deserve their OPness when that happens, while here, the guy genuinely knows a lot + he is hard working, humble, ever curious, a bit like an absent-minded scientist full of ideas. It's pretty sweet & funny.
The story alternates between daily life narration (& info dump), action & philosophical moments (let's just say that the tea chat is rather famous by now, lol). I guess the contrast might be jarring for those who look for a more typical isekai. But I like this story precisely because of the reflection moments. The MP might be hilariously dense & lacking common sense, but he genuinely thinks things through when it comes about certain important issues. The MP is basically a contrast of qualities, which makes this novel fun to read.
The story goes at it's own pace, there is no huge drama, any harem, or flashy stuff to speak of. I truly love how straightforward, honest & sweet the MC's are. Most times, I barely paid attention to the fact that Mr. Ex-Assassin is technically an OP character, since said power is mostly used for very sweet purposes, buhahaha. This Novel is truly about two hardworking, shy, awkward & incredibly sweet characters building a life together. The rest is cherry on top.