While the battle to determine the next king of the demon realm has often been fraught, the rules were always clear. 100 demon children partnered with 100 humans would challenge each other, using 100 magical books. What none of them knew was that there was a 101st magical book, powerful enough to stop any of the others. Gash and Kiyomaro must begin a journey that will take them into the demon realm to confront the mysteries of Gash's past. But will they escape in time to help their friends in a battle with a seemingly unstoppable enemy?

A year after the events of the first season, a virus Digimon called Diaboromon appears and starts attacking the Internet. The children and their Digimon unite once more in order to prevent him from destroying every communications network on the planet.