Apocalypse 1820, the 21st year since the Central United Empire completed the peaceful reunification of the mainland. In order to ease the contradiction between the increasingly powerful imperial power and the theocracy of the church, an unprecedented saintess will be elected by the whole country. Surprisingly, the one who was finally chosen as the saintess turned out to be Lilian, the daughter of the vampire "demon" grand duke. During the parade of saintess, Lilian encountered an assassination incident, but a young boy named Bai Chen saved her. Lilian brought the boy of the unsigned species who protected her from attack back to the imperial capital, and met the emperor Lan Ya. What Lilian didn't expect was that her emperor's uncle would betroth Lilian to this young man and arrange for him to enroll in Geroni Academy where she was studying. Is There Some inside story? Lillian found this very interesting and agreed to the marriage. Thus, a light-hearted and cheerful campus love comedy unfolded amidst the turbulent conspiracy.