Episodes 1-4 of the Japanese anime series set at Cross Academy. The Academy is attended by two groups of students: the Day Class and the Night Class. At twilight, when the students of the Day Class return to their dormitories, they cross paths with the Night Class as they make their way into school. Yuki Cross and Zero Kiryu are the Guardians of the school, protecting the Day Class from the Academy's dark secret: the Night Class is full of vampires. Episodes are: 'The Night of the Vampires', 'Memories of Blood', 'Fangs of Repentance' and 'Trigger of Conviction'.