Very intriguing. I think it would be neat to learn more about the world(s) they inhabit. A simple concept can go a long way, I can appreciate that for sure. Apologies for the late response, notifications don't really work.

All good. The world when she was human is just normal Earth, though only thing special is when coming back eventually is that her eyes can things that weren't there before. So it's a hidden world that most people don't see. As for the other, just looks similar to normal Earth too. 1/3