Vampire Knight [TV]

Cross Academy is different from any other school. It has a Day Class and a Night Class, with different uniforms and no interaction between these two classes. Secretly, students of the Night Class are all vampires, led by Kuran Kaname, a noble vampire who 10 years prior saved Cross Yuki from the attack of a stray vampire.

Similar in these categories.

Death Note

Blue Exorcist

Bleach

One Piece

Ouran High School Host Club

Clannad

Vampire Knight

Toradora!