An Arranged Marriage to a Vampire, When did this Happen!

When a new guy comes to school for the last couple of months there are left and starts trouble at school and was sent to kill a girl, you know something is up. When that new guy turns out to be a vampire and the girl he has to kill is arranged to be married to her vampire boyfriend who happens to be the prince of vampires, things cant be good. The vampire prince knew eventually he would have to break it of with his girlfriend to marry someone else that he didn't know or love because his father said so and told him in the first place not to get involved with someone while in the human school, you think controlling parents. And to make things more complicated neither the vampire prince or the girl knows that they were arranged to be married to each other by their parents, things start getting a little out of hand. But when the new guy's actual goal is to make it so the vampire prince doesn't get to rule, you someone is holding a grudge of some kind or burning hatred.