The treachery of Meicoomon, the digital monster who had lately joined their group alongside her human partner, Meiko Mochizuki, has shocked the Chosen Children. Koushirou Izumi is determined to find the source of the illness that has taken possession of Meicoomon. Meanwhile, Takeru Takaishi notices that his own companion, Patamon, is exhibiting troubling symptoms similar to those seen in other afflicted Digimon, such as Meicoomon. Just then, the Chosen Children get a message from the enigmatic entity Homeostasis, informing them that their planet, as well as the Digimon's home, is in risk of ultimate annihilation. Homeostasis intends to carry out a "Reboot," which will erase the virus by resetting all of the data that makes up the Digital World.