Vampires fought against humans war after war, slaughtering their species and mass murdering the humans for their blood to benefit their own survival. They turned weak and anemic without feeding the proper amount they needed to suffice their bodies and stay strong. Majority of the humans didn't want to be used as a source of food to these monsters despite their needs for blood to flourish in growth, they didn't sympathize with their species at all, and thus they became a heartless plague of ki