Vampire Knight

Vampire Knight (ヴァンパイア騎士 ,Vanpaia Naito?) is a shōjo manga and anime series written by Matsuri Hino. The series premiered in the January 2005 issue of LaLa magazine and is still on-going.

Plot
Years ago, Yuki Cross, a student in the Cross Academy of the Day Class, was attacked by a vampire and saved by Kaname Kuran, another vampire. She has no memories of her past before this day. Thus, she was adopted by Headmaster Kaien Cross and later on became a prefect for his school which has one main purpose: that vampires would coexist peacefully with humans. Zero Kiryu, fellow prefect, who also was adopted by Cross and therefore becoming her "brother" has a tragic past: his parents were killed by a pureblood vampire and now he's determined to kill them all. Upon discovering that Zero was bitten by a vampire 4 years ago, Yuki tries to save him from falling to Level-E vampire by offering her blood to him and therefore deepening their bond. Yuki's quest is now to discover her past and what really happened that night that Kaname, leader of the Night Class (aka Vampire Class) saved her and what he's really hiding from her.