Cross Academy is attended by two groups of students: the Day Class & the Night Class. At twilight when the students of the Day Class return to their dorm they cross paths with the Night Class on their way to school. Yuki Cross & Zero Kiryu are the Guardians of the school protecting the Day Class from the Academys dark secret: the Night Class is full of vampires! A war among vampires has started at Cross Academy & even Day Class students are being attacked. Kaname finally reveals his hidden plan to Zero & Zero must choose on which side he will fight. But in order for Zero to defeat the enemy he will have to take part in an atrocious act...