The begin of imagination

Hello, my name is Christopher John Francis Boone and I'm writing a book about vampires. My story begins....

In high school Cross High Scool Students are divided into two "classes": the day class and night class. This school has a secret, students are vampires night classe. Obviously the day class students or teachers don't know, there are only two people called guardians who know. These two people are called: Yuki Cross and Zero Kiryuu.

Yuki is the daughter of Cross director. When she was small, one vampire attacked but saved another vampire, Kaname Kuran. Kaname Kuran also studies at the institute. Zero Kiryuu is the adopted son of the director and deeply hate the vampires because they killed his family. Yuuki is friends but still not very confident in it.
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These guardians are in class during the day and at night watch over students in the class day to make things safe for the day class. Because of this Yuki and Zero will spend most of their time in class sleeping and almost always get expelled.

The vampires of this institute are the pride of their race because they can live with humans drinking pills of blood. There are four kinds of vampires: the A: pure blood, the B: vampire powers, the C: normal vampire and the D: vampires were once human.

There's a secret that nobody knows that Zero is a vampire in the process of transformation of class D. The only people who know him are Kaname Kuran and the director. Zero Yuuki discovers when just processing stage and can't control their thirst and attacks.

Yuki when to discover feels guilty because all this time, Zero, has injuried himself. Zero, the director, want to transfer the class but Yuuki convinces him and Zero to continue in his class.