Rosalia, a talented magic tool developer, is chosen by royal decree to become the queen of the crown prince, Wilbert. For the sake of her beloved family and people, she has supported her country from the shadows, but Wilbert, who is obsessed with his concubine, declares he has no intention of loving Rosalia. After six years of being ridiculed as the unloved queen in a sexless marriage, Rosalia's life as a queen in all but name comes to an abrupt end when Wilbert's concubine becomes pregnant. Rosalia's heart is as light as a feather as she finally achieves her freedom! She then leaves the country with Ares, her butler, who has been by her side for many years. Upon Ares' proposal, he would take Rosalia to his hometown, which turned out to be the kingdom of Lacteus, a land of dragon people known only through books of old. The dragon people are said to possess knowledge beyond that of human understanding, a to have a one and only companion of their choosing. Rosalia is convinced that the mysterious Ares, who possesses enormous magical power, is a dragon person, but it seems that he has other secrets as well...!