The year 20XX. Humans called "Concodes" and ultra-high-performance AI called "Codeman" team up as buddies to compete in the card battle game ZENOZARD. People are going wild with excitement at the world championships, THE ZENON.
One day, Souta Azuma, an average high school student, is challenged to a battle by a mysterious woman, Eilietta Lash. She reveals that she’s a Codeman and that her intent is to team up with Souta and participate in THE ZENON. Souta reluctantly agrees. Souta and Eilietta’s first opponent turns out to be the super-famous player Shion Saionji, who attends Souta’s school, and her buddy, Ash Claude.
Hinaria is unemployed, gaming every day. One day she decides to hack the servers belonging to the Beholder Group for some money, and she stumbles across a carefully secured record of two witches, Alice and Rimel. The two women wished to coexist with mankind, and the history they experienced is connected to the modern ZENONZARD.