In 2020, the Internet has become an indispensable part of people's lives today. However, what humans don't know is that there is an infinite world on the other side of the Internet - the Digital World, and the Digimon who live in it... A large-scale network failure occurred centered on the metropolitan area, with flashing lights and garbled outdoor screens... The news reported that it was a cyber terrorist attack. The protagonist of the story is Taichi Yagami, a fifth-grade elementary school student living in a high-rise apartment in the suburbs of Tokyo. Staying alone at home to prepare for the weekend summer camp, his mother and sister Hikari Yagami took a train that could not stop. In order to save his mother and sister, Taichi rushed to Shibuya, and when he went to the station platform, an incredible phenomenon occurred, and Taichi went to the Digital World! The children met their partner Digimon and faced the unknown "adventure" together!