This is a battle system using the mechanism of a card game, and is performed not by a digital monster card game but by rules peculiar to the game.
The stage is a digital world where the intensity is determined by cards. It is governed by seven card readers who are at the top of the card battle. But File Island is threatened by a sudden bug card. The card readers kept each other in check and wouldn't cooperate. The hero summoned by Babamon is said to be a legendary hero. Babamon entrusted him with the deck and he collected Sevens cards.
