Freya is a shy but athletically bold girl living in Tena, a small village situated within the kingdom of Tyr. Radiating kindness, she is cherished by the settlement's residents, while the courage of her close childhood friends—Aaron, known as the "Black Knight of Tyr," and his younger brother Aleksi—has made them proud local heroes. Since the two brothers have been serving the kingdom's Crown Prince Edvard at the capital for the last three years, their sudden return marks an emotional reunion for the trio. However, the joy is abruptly interrupted when the brothers inform their adoptive mother, Skadi (Freya's birth mother), that they are preparing to defend against Sigurd—a neighboring empire threatening war unless Tena is surrendered. Tensions escalate further when Freya overhears that Prince Edvard is dying and that Sigurd is willing to take Aaron's head instead if Tyr refuses to hand over Tena, prompting her to flee to the kingdom's Rokka Castle to warn her beloved friend. Instead of finding him, she encounters an individual who bears a striking resemblance to her and quickly gives Freya a dying wish: to protect Tyr by taking his place as Prince Edvard.