Edit: apparently this is a very common form of Japanese storytelling called an isekai. There are 8 billion people in this world, no idea can be original. And sometimes you miss out on things many other people know. I’m clearly one of today’s lucky 10000.
It is exactly like our world, only all doors that you expect to open outwards, actually open inwards, and vice versa.
Then I won’t even notice I’ve world swapped until I meet my clone