At first I thought it was the girl that did not age was normal and Rose was going to turn out to be a bad guy. But then I thought before it should rose aging that it was the other way around(by that I mean that Rose was normal and the other girl was not) and I was right. I wonder why the girl is lonely on her side. Did she have parents or something else? Still, it was a good story that can also give you a lot to think about.