Sixteen-year old student who becomes is actually the heir to the throne of the Kingdom of Kei, but she must first fix all the problems troubling her kingdom.
Youko is a sixteen year old student going to a local school in Japan, and usually worries about her unusual red hair. However, when a man named Keiki suddenly shows up and vows to protect her, she is suprised and shocked. When the school is then attacked by a giant bird, she quickly accepts his offer. He then gives her a sword and transports her across the Void Sea and to the Twelve Kingdoms, where she ends up in the Kingdom of Kou. Originally, Youko is very confused and somewhat scared at all the confusion she had.She didn't know where she was, why she was dressed the way she was, and how to get home. When she goes searching for Keiki, she battles many monsters and forms/breaks many bonds. While traveling, she meets and befriends Rakushun, and they escape to the Kingdom of En. There she learns that she is the heir to the thrown of power in the Kingdom of Kei, and she is initially cautious of taking the role, but eventually agrees.