Yuki Cross, who was adopted by the headmaster of the Cross Academy after a vampire attack, must protect the students in the day classes from the vampires in the night classes.

Yuki is attacked by another pureblood outside a graveyard for meddling in the ways of the vampire society. Injured, she returns home to Kaname, who shares with her his past memories and the truth behind the Kuran family.

The Vampire Hunter Society has imprisoned Aido in order to interrogate him about Kaname's connection to Sara Shirabuki. Meanwhile, Yuki wants a fresh start withg Kaname, but circumstances arise that may force them apart.

Kaname has returned to Cross Academy to kill Sara Shirabuki. Zero has joined forces with Sara, leaving Yuki in the middle of the conflict. Even if Kaname's ultimate goal is to kill all purebloods, is Yuki ready to fight him?

The Night Class is back in session, but Yuki finds herself quickly becoming second fiddle to Sara Shirabuki. With Kaname gone, Yuki is now desperate for blood, so Zero offers her his own. Will she break her promise to Kaname and drink from Zero?