An ideal society managed by Sapotamas. Underneath, terrifying creatures called Digimon appear. After a classmate is attacked, Tomoro Tenma's emotions explode. Suddenly his Sapotama shines and Gekkomon is born.

Gekkomon is awakened by Tomoro's anger and overwhelms his enemy. Just then, a mysterious Digimon steals their Sapotama. With his brother lost, Tomoro shuts down emotionally, until he is shocked by what the leader of the "Glowing Dawn" has to say.

Reina is in high spirits after being handed leadership for the next job by Kyo. But, because of Tomoro's mistake, the Machmon bounty escapes. Rookie member Tomoro can't understand Reina's obsession with the Glowing Dawn being a family.

Upon learning that the bounty intel is wrong, Tomoro and Gekkomon follow the scent of his own e-Pulse. There they find the Mirror World, a virtual space inside the net. Inside the Sapotama that glows within Hyemon…