A girl, and her twin, are the only two vampires that are born a full blooded vampire, and when their school gets burnt down to find them they realize just how much they would be and asset to the Others. The Others are a group of vampire, or in some cases, dhampir or half vampire, who want to get rid of all werewolves, but because of her friendship with a group of werewolves and her own beliefs she has to do her best to keep herself and her brother away from them.
Formally: I'm a Vampire he's a Werewolf and yes were twins.
Years ago there was a mysterious murder. A young girl surrounded by animals all drained of their blood. The only thing they all had in common was the puncture wounds on their necks. Fast forward to the present day a pair of twins are in high school. One is a vampire with a blank space where her childhood memories should be and the other is a werewolf who wishes he was anything else. Both want what anyone else wants in life: normalcy, but this maybe the closest to normal that they'll get.