Nishi no Yoki Majo

Fifteen-year-old Firiel lives in the remote highlands with her reclusive father. Country life is pleasant enough for Firiel--her father's servants adore her, his apprentice Rune is a good friend, and she's about to attend her first ball! But as Firiel prepares for the gala, she discovers her past is more complicated than she had thought--and she may be the heir the throne! Unaware of the danger that faces her and those whom she loves, Firiel courageously quests for the truth. In this unique, evocative Cinderella story, heritage and destiny converge to change a young girl's life forever!

(Source: Tokyopop)