Episode One :
"Night of the Vampires"
Yuki Cross recalls her earliest memories in which she is attacked by a vampire, and saved by the pureblood vampire Kaname Kuran. In the present, she attends the Cross Academy, a school founded by her adoptive father, Kaien Cross, and she works as a "guardian" with vampire hunter Zero Kiryu to protect the human students of the "Day Class" from the vampires of the "Night Class", an arrangement created by Kaien to foster better relations between vampires and humans. That evening, Yuki discovers a pair of Night Class students, Hanabusa Aido and Akatsuki Kain, threatening to feed on a pair of Day Class students. Yuki attempts to stop them, and they retreat only after Zero arrives and threatens them with his anti-vampire gun, Bloody Rose.

Watch It Here : http://www.youtube.com/watch?v=0gfYxNeSVLA
[Part One]

Watch It Here : http://www.youtube.com/watch?v=zOM7u8kBuMw&feature=related
[Part Two]

Watch It Here : http://www.youtube.com/watch?v=xzOXr4l7v2Q&feature=related
[Part Three]