In 2020, technology is ubiquitous. Every digital device worldwide is linked by a single network through which data travels. Unknown to humans, this network has become the habitat of life forms called "Digimon." Fifth-grader Taichi Yagami is getting ready for summer camp when odd events start in Tokyo; specific electronic systems have begun malfunctioning. Upon finding that his sister and mother are trapped on a runaway train, he hurries to the nearby station. Suddenly, Taichi is whisked away to another world, where he encounters a peculiar creature named Agumon, who somehow already knows his name. Taichi also obtains a strange gadget called a "Digivice," which enables him to communicate with the undigitized world. Taichi realizes he is inside the "Network," and virus-like Digimon are assaulting the sectors that sustain Tokyo’s electronic systems. It falls to Taichi and his new partner Agumon to halt these cyberattacks before the entire world is endangered by the deeds of mischievous Digimon.