In the Kingdom of Noeld, the noble Klaus family has carried out the king’s secret orders as Santas, delivering presents on Holy Night. Now 16, Countess Christina Klaus is about to embark on her first mission. Using a sacred magic unique to the Klaus bloodline, she is supposed to put the entire kingdom to sleep and deliver gifts unseen. But something goes wrong—one man remains awake! That man turns out to be Mikael, a royal guard assigned to Prince Rubel. Even with her face hidden by magic, Christina is spotted—and worse, he realizes she’s a girl. Her first mission ends in complete failure. She vows revenge on him—but for some reason, ends up helping Mikael improve his health instead!? A perfectionist and naive heroine gets completely thrown off by a naturally airheaded knight in this magical romantic comedy!