At prestigious Cross Academy, there are two sessions of classes, the Day Class and the Night Class. As the school's Disciplinary Committee, Yuki Cross and Zero Kiryu keep watch over the Day Class students, who are all infatuated with the beautiful, elite Night Class students. As Guardians, Yuki and Zero must also protect the secret of the Night Class, they are all vampires! Yuki is torn between the two people she cares for most when Zero is accused of Shizuka Hio's murder and Kaname refuses to attest to his innocence. Drawn deeper into the world of vampires, Yuki struggles to recall the events of ten years earlier but fails time and again, despite Zero's help. Kaname continually evades Yuki's questions, but when her visions of blood grow more frequent and intense, the past may come to light whether anyone wants it to or not!.