This is literally the exact plot of iron virgin Jun, but it's with a dude instead of a girl.
So many people in the comments are complaining that the Uke isn't the best or smartest person in the world, in a manga that is literally called "Trash Omega". The title told you beforehand what you were in for.
This is literally the exact plot of iron virgin Jun, but it's with a dude instead of a girl.