Immortal tales of the past and present from the world of Vampire Knight. Ai tries to protect her little sister Ren from every danger, for Ren is despised by many of their kind who hate Ren's vampire hunter father. Although Ren is not as strong as her pureblood sister, she finds she has her own gluttonous thirst for blood. Ai tries to protect her little sister Ren from every danger, for Ren is despised by many of their kind who hate Ren's vampire hunter father. Although Ren is not as strong as her pureblood sister, she finds she has her own gluttonous thirst for blood.