The Digimon demon lords powers grow, slowly, but surely. The greatest of them are gathering vast armies in the Dark Area to invade the new digital world with. Something had to be done. The Seers council petitions the great host network intelligence Yggdrasill to bring a chosen Digi-Destined human to the new digital world.
Yggdrasill opens a connection to the real world, using the internet to contact a chosen Digi-Destined child.