Mahou Gakuen LUNAR! Aoi Ryuu no Himitsu

Synopsis (en anglais)

Barua of the Magic Race (Vile Tribe) has kidnapped students of the Magic School. Elie, Rena and Senia,are asked to look for them by the schools master. Along their search they find interesting and crazy things, and get into trouble as usual. Upon finding the students, they find their magic is not strong enough to save them, but they get some help from an unwanted friend. (Source: Anime News Network)