Vampire Knight is a Japanese manga series created by Matsuri Hino. It follows the story of Yuki Cross, a girl who attends Cross Academy, a school that separates humans and vampires. The academy has a Day Class for humans and a Night Class for vampires, where Yuki serves as a guardian to maintain peace between the two groups. The plot revolves around Yuki's complicated relationships with Kaname Kuran, a noble vampire, and Zero Kiryu, her childhood friend who despises vampires. As Yuki uncovers her past and the truth about her identity, she faces challenges that test her loyalties and beliefs.