Yuki’s earliest memory is of a stormy night in winter, wherein 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, has grown up and become a guardian of the vampire race, protecting her savior, 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 who’s hatred for the creatures that destroyed everything he held dear, is now determined never to trust them. This coexisting arrangement seems all well and good, but have the vampires truly renounced their murderous ways, or is there a darker truth behind their actions. Is Kaname’s infatuation with Yuki the beginning of a forbidden romance, or is it something in her forgotten past that draws him to her. Because in this world of secrets, nothing is as it seems. And the price of misplaced trust may even be worse than death.
本作的故事发生在黑主学园，学园存在着两个班级,那就是白天的日校,晚上的夜校。美型精英集团“夜间部”，里面的主要成员都是一些超美型的帅哥，而且他们 的身份不是人类，而是习惯于暗夜行动的吸血鬼。本作的女主角优姫和她朋友零则属于“学园守护人”，其主要职责就是守住校园内有吸血鬼这个惊天秘密。没有十 年前的记忆的优姬，憧憬着美丽而且有着纯正吸血鬼血统的夜间班寮长柩，一边守护着他们一边与伙伴零、抚养自己长大的养父——黑主学园的理事长一起度过自己 的学园生活。