[KILLUGON] Elite vampires run a boarding school for human students in order to coax magic out of them and enlist them as defenders of the prestigious vampiric houses. These families fight with their human pawns in order to gain dominance and wealth. Gon gets a full scholarship to this private school and, of course, opts to attend. In doing so, he signs his name over to the Zoldycks, one of the largest vampiric households at the university. Gon is expected to perform the duties of a human subject under a vampire's command-specifically, Killua's command. tl;dr Fate Stay/Night meets Vampire Knight