Sapphire: Ribbon no Kishi

サファイア リボンの騎士

Sapphire was supposed to be a tomboyish junior high school girl who's not interested in boys, but it all changed on her 14th birthday. Not only did she find out that she's prince Sapphire, the Ribbon Knight, but she also has to protect a country called Silver Land!?

(Source: Divine Sanctuary)