Fair at best; although I did like the premise, the ending was just so sudden that it simply ruined any momentum the story might have had going up until that point.
Truthfully, even before that point you could tell things were being rushed. Everything, from their relationship to her dealings with her clan while coming to understand the outside world, all of it had been put on fast forward to try to cram it all into one volume. Now I don't know if the author had originally planned to have another volume, or was forced to end it when they did, but even just a few more chapters could have wrapped things up nicely. As it is though, we're left with a story that showed a lot of promise, but is just filled with too much for the space with which it's allotted.
As for the extra story, I didn't care for it at all. It was rather boring, and I came away from it not feeling like it had served any purpose other than to add some additional filler material at the end of the book, and I would have much rather have had the main story use up those three chapters in order to get some proper closure.
In short, I really can't recommend this one at all. An interesting premise doesn't make up for the fact that the artwork is merely average, and the story only teases the reader with a number of questions that are never answered and ideas that never go anywhere.