Leviathan: The Last Defense

Plot
Zettai Bouei Leviathan is set on a planet called Aquafall, a fantasy world filled with water, lush greenery, dragons, and fairies.

When a shower of meteorites suddenly bring forth evil creatures that threaten the planet, the fairy Syrup assembles the Aquafall Defence Force. She recruits three girls of the dragon clans to be members of the task force. The story follows Syrup and the dragon girls named Leviathan, Bahamut, and Jormungandr as they work together to battle enemies.

Official

 * Official anime website

Other Sources

 * Wikipedia
 * Anime News Network