Haven't seen something like this before.
This is the second flash I've seen from you, and I think it's pretty high quality, and the drawing really improved. The idea is very nice, and it attracts me: I want to read more. Although the story is pretty sober, the drawings were pretty cheerful, so that contrasts nice.
I don't really get the first three pages of the ''book'' though, the ones who are mainly dark blue. They were beautiful, but a bit weird. Could you explain that a bit more? Or is that coming in the next episode?
Maybe, for improvement, you could make something else move in the pictures except for the text. That would make the book pop a little more, and give it something extra. And could you make that you skip to the next page if you press the right/left keys on your keyboard?
Nonetheless the drawings are great, and the story was pretty good too. A bit weird, but not in a negative way.