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.
before Isekai, it was called getting Narnia’d. Last book happens with a similar situation
This. Of course isekai is a thing, but it’s not like the concept is exclusive to Japanese culture