Vampire Knight: Ice Blue no Tsumi

Ice Blue Sin (Main Story)

In the hours of twilight, an intrepid Day Class girl sneaks into the most forbidden place on campus – the Moon Dormitory of the Night Class students. While these scions of vampire aristocracy do not usually take note of humans, Fuka was warmly received and even invited back among them. Something about her has got the Night Class talking, and when one becomes bewitched by the darkness, there can be no turning back...

Season of Transience (Extra Story)

Born into a distinguished vampire hunter family, young Zero is destined to follow in the footsteps of his ancestors,. Used to the safety and security of training with his master, the arrival of a senior disciple soon opens his eyes to the harsh reality that is the life of a vampire hunter. Before Cross Academy beckons, this one event shall forever reshape the boy's childhood and turn his eyes jaded to the world.

(Source: Chuang Yi)

Vampire Knight: Ice Blue no Tsumi was published in English as Vampire Knight: Ice Blue Sin by Chuang Yi on April 10, 2011.