One day, Hiro Enryuu - a regular kid attending elementary school - is whisked away to Dragon Earth: the fantastical realm from the popular "Dragon Collection" game. Dragon Earth is a place where gods, humans, and monsters coexist. People who use their Grimoire magic books to summon creatures with cards are called Dracolle Battlers. Even though he's bewildered, Hiro decides to become a Dracolle Battler and embarks on a journey with his newfound friends to reach the lofty heights of being a Dragon Master!