The year 2020 saw a global network connecting all digital devices, but unknown to humans, this infrastructure had become home to life forms called "Digimon." Fifth-grader Taichi Yagami was attending summer camp preparations when Tokyo experienced electronic system failures. Taichi's sister and mother were trapped on a runaway train, prompting him to rush to the nearest station. There, he met Agumon, a strange creature who already knew his name and was accompanied by a mysterious device called a "Digivice.