Yusuke was a normal card game otaku until he opened a card pack that summoned him into a world where card games were magic and decided the fates of kingdoms. He possess the body of the summoner, Reiyu, that brought him to the world to duel the various monsters and enemies that threaten the kingdom of Deuxsol. Now he needs to unravel the mystery that brought him into this world and the game mechanics of Card Arts or be trapped as a spirit forever.