Everything up until he gets into school is just too... convenient. He just happened to find several girls who all happen to become crazy OP and who all happen to be in love with him from the get go and who all happen to... (you get the point). Like, I get that's the joke, he's just faking the entire thing "but it turns out it's all real!" But still, I'd have liked some more development of his earlier years after he isekai'd.
It kinda reminds me of Overlord; a person pretending to be something they're not but inadvertently becoming that exact thing.
I'm enjoying it much more now, it's just those first few chapters that bug me.