Yona of the Dawn

King Il of Kouka, a land said in legends to have been founded by four dragons, has only one remaining heir, a daughter named Yona. She lives a happy life in the palace with her cousin Soo-won, who she loves in spite of her father's opposition to them marrying. Her life is turned upside down when Soo-won murders her father and steals the throne. Yona, with her childhood friend and bodyguard Hak, must retreat to gather allies and reclaim her place as ruler of the kingdom. (Anime News Network)