This is quite the standard isekai manga. Someone gets teleported to a different world and has op powers. Except the MC is, as you would guess, a 40 year old man. It's a nice change of pace cause its not a teenage boy being surrounded by "plot". There's not really any romances because of how they set up the MC and also most of the females are way younger than him.
There's some good things about the manga, depending on how your tastes are. They go into a lot of detail about the magic system which is neat. The MC legitimately understands the powers he has and it makes sense. Its not the generic, "(Insert bad thing) happened to me so I must take revenge with these op abilities," or the " I'm a teenage horn boy who has a full grasp of my op powers in like 10 minutes and am basically God." I also like that the MC is blunt about what he says.
My only problem with this is the MC's end goal. Whenever a MC says," I want to live peacefully," they never do it. I know its for the story but come on man. If youre gonna make the MC's goal to live peacefully dont make him crazy stupid OP.
All in all, a better isekai compared to others but not a masterpiece. The MC is what really pushes this manga for me. 7/10.