Rent Vampire Knight: Series 2: Vol.1 (2008)

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!