The young street girl Yuki unexpectedly ran into the legendary synonym for nightmare—a vampire in the vast snowy countryside.
At the moment of life and death, Jiu Lanshu appeared and rescued the girl, and brought her to the chairman of the Black Lord Academy, asking for the chairman's care.
Ten years have passed. The little girl back then is now the first-year disciplinary committee member of the regular class at Black Lord Academy. Kulanshu, who saved Yuki back then, is also the monitor and president of the night department of the Black Lord Academy, as well as the president of the Moon House.
The night class has an unknown secret, that is, all members of the night class are vampires. The respected senior Jiulan is a pure-blood vampire known as the "vampire among vampires".
The vampire family all appear in the world in human form that is elegant, beautiful, and talented. As a result, these beautiful vampire teenagers have become the objects of admiration for girls in ordinary classes.
The contact between humans and vampires has inappropriate reasons. Therefore, Yuki and another disciplinary committee member, Rei Aizhi, took on the role of guardians of the college, dealing with troubles that arise when human students come into contact with vampires.
Zero's family was killed by vampires four years ago, but Zero miraculously survived and was taken in and cared for by the chairman. The unfortunate past has made Zero's character extremely cold.
Although Jiulan has a crush on Yuki, he is hesitant because of the racial gap between the two; while Zero also has feelings for Yuki, but his slow emotions and hard heart prevent his feelings.