To foster peace among the nations, the prince of the Saga Kingdom, Latio, and the prince of the Western Theodor Empire, Iaras, are exchanged, much to the dismay of Hilna, the princess of West Theodor and Iaras' twin, who struggles with the shackles that come with her royal title. The free-spirited princess and Latio manage to form a bond the more time they spend together. However, the arrival of King Nia, the ruler of the Eastern Theodor Empire, starts to change the dynamic of the two royals' relationship...