Tenkuu no Escaflowne

When high school girl Hoshino Hitomi dabbles with tarot cards she suddenly finds herself on a strange world called Gaea. With her new found friend, Van Fanel, the young prince of the devastated kingdom of Fanelia, Hitomi becomes involved in the battle against the Zaibach forces, an evil empire bent on conquering the planet.

(Source: Tokyopop)