Long ago, a land was divided into four countries: Sou, Kou, Do, and Ah. The King of Ah married a woman from Kou and soon after another from Do, forming a fragile alliance among the three nations. When the Second Queen bore a son, the King discarded the ailing First Queen and her daughter, Aki, casting them into the depths of the Palace. However, by fate, Princess Aki meets a slave named Hakusei, who possesses unusual golden hair and sky-blue eyes. He pledges his life to her and assists her in training in the Six Arts under the tutelage of the mysterious merchant Seitetsu; yet, when Aki surpasses the Prince during a hunt in an effort to earn her father's recognition, she ignites a war by tarnishing Do's honor and prompts the Second Queen to poison her mother. With only her loyal Hakusei remaining, Aki is exiled to the small country of Kou, vowing to return to Ah one day for revenge. But against the powerful allied nations of Do and Ah, will the two survive long enough to fulfill Aki's vow?