what is vampire knight about?

Yuki's earliest memory is of a stormy night in winter, where she was attacked by a vampire... And then rescued by another. Now 10 years later, Yuki Cross, the adopted daughter of the headmaster of Cross Academy, Kaien Cross, has grown up and become a guardian of the vampire race, protecting her childhood crush, Kaname, from discovery as he leads a group of vampires at the elite boarding school. But also at her side is Zero Kiryu, a childhood friend whose hatred for the creatures that destroyed everything he held dear leaves him determined never to trust them. Later, reaveled that Yukki is actually a Junketsu (Pureblood) Vampire and she's the sister of Kaname, also about how her parents get killed by her own uncle and is Kaname actually her brother or not . Then the journey of Kaname, Yukki, and Zero continues...

a young girl named yuuki cross/kuran
she was born a vampire
full blood or purebloodhad two vampire pureblood parents juri kuran and haruka kuran and a lovely brother named kaname kuran
one night her uncle killed her parents and before her mother died she changed yuuki into a human and erased her memories on a snow night and was attacked by a vampire then kaname saved her and she and zero kiryu came along and his family was killed by a pureblood vampire and since that day headmaster kaien cross looked after him aswell as yuuki and they became gaurdiands for the academy protecting their secret that their all vampires and yuuki does not realise that zero has been a vampire that whole time and she aventurly gets bitten by him and she faints and later on yuuki gets bitten by her brother and she becomes a pure blood vampire again and goes off with kaname and marries hanabusa then cheats on him and goes to kaname .picture put on here is yuuki marring hanabusa/aidou