Dragon Mages of Corseltel(2006)

Corseltel no Ryuujitsushi

Corseltel, a sacred land where dragons and beastmen reside.
Protected from the outside world by valleys and mountains, it's inhabitants, including Dragon Mages (ryujitsushi), live in harmony.
The Dragon Mages are able to borrow and utilise the dragon's magics, but have to care for and look after the dragons as an exchange