Appmon's world:

Once again, the ones who saved our world before are needed to protect all the dimensions from another danger. A new adventure will begin...

An evil digimon from the past tries to find a way to come back to live. And he chooses a dimension where there's no digimon tamers or digidestigned to start his evil plan, but a certain person interferes and transfers the applidrivers from their world to that dimension to help with the mess.

New kids will be chosen, new heroes will appear, problems will strength friendship, yesterday's enemies will become today's friends, and children will have to grow up more...