I'm of mixed feelings about this one. On the one hand, it is superbly well done. On the other, I feel a little like my social contract has been violated (joking a little).
I would guess that this is much closer to the horror sources listed than to Buffy or Twilight (even though it's clear where those inspirations come in in the mechanics, it's very nicely done). This is skewed towards true horror with a salacious, malicious bent. Which I can see is in the blurb, now that I'm looking for it and not blinkered by the word "Twilight". Firmly on the "these stories is a metaphor for the horrible things people do as adolescents" side. Much more complex and difficult than I expected. This is... a good thing? I think.
The mechanics are great and accomplish exactly what they promise. The "growing up" mechanics are brilliant. With the right group this would allow you to tell amazing, rich stories with emotional impact and sexy, disturbing things happening all the time.
Sadly, I don't have a group like that, but I'm still glad I purchased it and read it cover to cover.
[5 of 5 Stars!]