Gurumin

"Parin, a strong-willed girl sent to live with her grandfather in a small mining town. Parin discovers a friendly group of monsters hidden behind her grandfather's town in Monster Village. She is quickly drawn into a battle between the monsters and Phantoms, evil fiends that want to destroy the monsters and cover the world in Dark Mist. Learning of the Legendary Drill, a powerful weapon that she alone is fit to wield, Parin embarks on a quest to stop the Phantoms and save Monster Village."