In a futuristic era, where humans known as 'Concodes' join forces with advanced AI 'Codeman' partners, the thrill of competing in the card battle game ZENONZARD captivates the world at the prestigious championship, THE ZENON. Amidst this fervor, Souta Azuma, a typical high school student, faces an unexpected challenge from a enigmatic Codeman, Eilietta Lash, who proposes they team up for THE ZENON. Reluctantly, Souta agrees, thrusting them into a match against the renowned player Shion Saionji and her Codeman companion, Ash Claude, both fellow students at Souta's school.