Soul Mare is a shadowy facility, full of human agents and...a vampire. This isn't the type of vampire that sparkles and takes off their shirt to appeal to silly human teenagers, this isn't Dracula either. This vampire is a protector of humanity and a killer of dark spirits. In fact, human blood is deadly to Xero. Despite having lived for centuries, Xero has made himself a little human family, his "dad", Mikey, his "mom", Allison, and his "brother", Nix. Things seem to be settling into a pattern, drink the dark spirit's blood, consume it's energy, and keep the spirits from wreaking havoc. Who knew though that what he really needed to watch out for...was a demon?