From CMX Manga:
This suspenseful, supernatural series tells the tale of Canon, the only student to escape from a bloody vampire attack that took the lives of her fellow classmates and turned her into one of the undead. Struggling against the terrible needs that compel her, Canon commits herself to use her powers for good and do whatever she can to avenge the deaths of her friends and her own terrible fate. Joining forces with a talking, vampire crow, she begins her quest to find Rodd, Lord of the Vampires.