Due to an unexpected twist of fate, Hiro Enryuu, an ordinary elementary school student, ends up in the world of the "Dragon Collection" game. This realm, known as Dragon Earth, is a place where gods, humans, and monsters coexist. Individuals who traverse this world using a magic book known as a Grimoire and cards to summon monsters and hunt for treasures imbued with dragon powers are referred to as Dracolle Battlers. Despite his confusion, Hiro becomes a Dracolle Battler and, alongside the friends he encounters there, embarks on an adventure to become a legendary Dragon Master!