Kazuna Takashiro cant escape the pain of his past. Ever since his mother died, nightmares and visions have been eating away at him. When he finds his long-lost sister, Chizuna, the two discover they share more than just a family name. The siblings are cursed with a disease of the blood-a disease that will turn them into vampires! As they resist accepting their destiny, Kazuna and Chizuna struggle to contain the craving that is the very essence of what they will become.