Z/X: Code Reunion

In the not-so-distant future, five portals suddenly appeared acting as gateways to alternative worlds. However, these five worlds are actually the same world, but in different timelines. As the situation becomes increasingly dire, the inhabitants of each world will stop at nothing to ensure the survival of their own timeline, even at the expense of the other timelines. The key to survival lies in one card-shaped device...

The story takes place in the near future in a city called Heartland. Tsukumo Yuma is a young duelist who strives to become the Duel Monsters champion, despite being an amateur. One day, during a duel with a school bully, a mysterious spirit called Astral appears before Yuma, and helps him to win. Astral then explains to Yuma that he is searching for his lost memories, which have been transformed into 99 "Xyz Monster" cards called "Numbers" and have been scattered across the globe. The "Numbers" have the ability to possess the duelists who own them and bring out their darkest desires. In order to recover his memories, and collect the "Numbers" cards, Astral teams up with Yuma.

The year 20XX. Humans called "Concodes" and ultra-high-performance AI called "Codeman" team up as buddies to compete in the card battle game ZENONZARD. 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.

In the otome game, a world of godless people was being menaced by Nightfly O'Note, a mysterious alien invader from a crimson world via the crimson barrier Scared. To counter the Nightfly O'Note's threat, the humans establish the LAG defense agency at the Ryūkyū Islands. The anti-Nightfly O'Note fighting unit Scared Rider valiantly stood against the threat, but was completely wiped out five times. And so, the sixth and latest unit, Scared Rider Xechs, was assembled from five young men. However, at nearly the same time that SRX was formed, the Nightfly O'Note invasion stopped suddenly. Without the enemy they were supposed to fight, the SRX members spend their restless days dealing with ordinary life. The SRX members establish the musical band Odd-l's to deal with their low spirits and restlessness. Meanwhile, a young woman is assigned to LAG as their instructor and commander. A new life begins for the young woman and the SRX. The tagline of the game, "That order, is it for love, or for death?"