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Kaien Cross is the Headmaster of Cross Academy. One night in winter, Kaien had foolishly agreed to hunt down Juri Kuran, who was vulnerable due to her pregnancy with her daughter. Juri spared Kaien's life and soon forgave Kaien for being irrational.

At some point, they somehow became friends, though Kaien still feels in debt to her. After befriending Juri Kuran Kaien took on Juri's dream of establishing a school for vampires and humans to coexist peacefully, and retired as a Vampire Hunter in order to establish Cross Academy 16 years prior to our story.

Cross Academy is attended by two groups of students: the Day Class and the Night Class. At twilight, when the student of the Day Class return to their dorm, they cross path with the Night Class on their way to school. With the assistance of a pureblood, Headmaster Kaien Cross founded Cross Academy under the influence of Juri Kuran's dream of having humans and vampires co-exist together. Kaien had mainly done this because he once made the decision to kill the Kurans, and he had stalked Juri, waiting for an opportunity to do so. He was, however, instantly defeated by her during their confrontation, and a bargain was made that he would create Cross Academy.

The fact that vampires are attending the Academy is a complete secret from the Day Class humans. They are not to know the existence of vampires, and if they do find out, their memories are erased on the spot. The existence of the vampires must be kept a secret, in Kaien Cross's mind, else humans would be too frightened to be near the Academy and animosity that would arise.

"I want to put an end to the war between humans and vampires; a war that has been continuing in the darkness of history since ancient times! I want the young vampires, with their natural intelligence and unfettered hearts, to become a bridge between the two species!! I'm educating them for that purpose! That is why I created the night class."