The second box set completes the series with vols 11-19 & an exclusive art book 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 Academy's dark secret the Night Class is full of vampires!