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Gon Freecss is enlisted into a family war without his knowledge. It isn't until he's unknowingly bitten by a vampire that he endures a magical awakening crucial to passing his university classes. Every last event that brought him here seems to lead back to Killua and the Zoldyck family as a whole, but no one is willing to explain the situation, let alone talk to him.
The Zoldycks are an ancient family of elite vampires on the cusp of an all-out war. To prepare for battle, their family has enlisted the help of human servants dubbed "champions"—Zushi, Canary, Amane, Hisoka, and unwillingly, Gon—who are especially adept at magic-wielding.
tl;dr A world were vampires create magic but can't use it, so they bite humans to give them magical abilities. Vampire bites act as an aphrodisiac, and boy howdy is Gon in for a wild ride.