Nightschool: The Weirn Books Collector's Edition Vol. 2 (manga)

Betrayed by one of their own, the Hunters have become the hunted as their hideaway is invaded by a pack of ravenous werewolves! But it'll take more than a few mongrels to get the better of these kids. Meanwhile, Alex begins advanced training with Mr. Roi. Will he be able to help her find a clue to her sister's disappearance? Or is the homeschooled Alex in way over her head? With the Sohrem rising, the Hunters on the move, and Alex caught in the middle, the shadow of the enemy who has been pulling all the strings begins to show. But is it the enemy without-or the one within her-that Alex should fear the most?!