Many stories move too quickly for characters to stop and think, but I always love seeing thought on the page or on the film. There’s a lot of thinking here. Faced with an extremely weird situation, a highschool student stops, repeatedly, to consider fresh information and fresh experiences, to see how they fit in: is she comfortable with this? How does that work? Would you really? And also, friends are terribly important to the story, which could easily be ignored in favor of a love triangle.
It's a very grounded and realistic book for one with such a high-concept basis.