Ace is an average boy until he hears his name being called by a mysterious egg. The egg leads him to discover the existence of Dragon Callers, humans who tame friendly monsters into allies in their fight against evil. With an egg calling his name, it seems that Ace is destined to be a Dragon Caller, but the road to summoning dragons isn't going to be easy. Now that he's aced the Guild Dragon Caller's exam, Ace and his newfound friends set out to test their skills in the world-famous Battle Cup. But first, they'll have to find their Soul Armor and gain more experience helping monsters!