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.

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…

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.

Tomoro wanders into an old shopping district where he witnesses the Panda-gumi protecting the town from thugs. Their leader Sasatake and Pandamon have a bond of father and child. Meanwhile, Yuukari of the Koala-kai prepares to evict the residents.

Pandamon is furious that Yuukari has hurt the boss but is conflicted between their feelings and teachings about chivalry. Tomoro wants to challenge Astamon in battle. Meanwhile, Kyo investigates the identity of the mastermind.

Tomoro and the others find hikers who’ve nearly fallen victim to Cold Heart. They are saved by an exhausted Kyo and Murasamemon. Deep in the mountain is an old observatory that holds Kyo’s secret.