Seria was born as an ordinary serf, but her extraordinary beauty makes her an outcast in her village. Growing up without any friends, she meets a young guardian dragon, names him Sizrelia, and forms a deep bond with him. But because guardian dragons are symbols of the imperial family's legitimacy, the emperor must hide the fact that a mere serf can form a pact with a guardian dragon by making Seria an imperial princess! But even with Siz by her side, can she handle life as a fake princess?