Carat!

Carat! (からっと!) is a manga series by Yoshitomo Watanabe. It was serialized in Comic Avarus.

Plot
In the land of Carat, a battle for the queen's throne and the prince's hand in marriage is up and coming. Yuni and Melissa are chosen as candidates for the throne and until a winner is determined, the prince remains in a magical sleep. But what does this have to do with Baba Kanon, a simple ninth grader with thoughts of revolutionizing herself?