The Demons of Terra X

TERRA X - A paradise with a catch. When Earth finally disintegrated, Terra X was the nearest, most habitable, Earth-like planet Man could latch on to, except for one major thing: demons roamed the land. As the years passed Man was able to tame these demons and send them back to the Underworld, with the help of alchemy passed down from generation to generation. 5000 years later, when their older brother was taken by a demon and their other brother mortally wounded, the young Dompteur (demon-trainer) George and his little sister Tilly must find a way to enter the Underworld to bring their brother back.