There are two types of vampires. the type 1 vampires, who look like humans and think they're better than humanity. they willingly turn and kill humans. type 2s are half bat/half human and see their condition as a curse, trying not to feed on humans. hunters know this, so when the type 1 vampires started a silent war on humans, type 2 vampires were recruited to help stop them. you are a type 2 vampire who's been recruited to help a group of hunters to stop the type 1s from killing off humanity