Platina

Auna is a girl forced into servitude to a petulant princess who presents her with a furry fox cub. Soon afterwards, Auna embarks upon the adventure of a lifetime when she learns that fox is really an adventurous boy trapped by a magical spell! Before she knows it, the pistol-packing teen and her unlikely ally journey into a fantasy realm unlike anything you've ever seen!
(Source: RC-Scans)

Platina had one volume published in English by Central Park Media on May 1, 2007, before the publisher became defunct. The series has also been licensed in French by Samji.