In the school bibliotheca, an outcast, the loser of the school, had gotten lost. The bibliotheca constantly changed and got bigger because it held every book ever written. There was a special puppet constructed to get the books, but she had forgotten about that fact and wandered off into the labyrinth of bookshelves. Now, she was lost. It was very dark, and then, she bumped into the incubus, Kassian, that had been tormenting the school, on top of that. Incubi were demons who ate the fear of people. They could manifest, but most of the time, they didn't do that. Kassian had intruded the school and had already gotten six students into the hospital station of the school. The teachers said he was an extremely powerful and dangerous creature.