While most of the world doesn't believe in monsters, there are many children in Tower City, New Jersey who do. It began when a MetalTyrannomon appeared in the Northeast district and laid it to waste. Many lost their lives in what was considered the largest terrorist attack in modern history. However, media coverage called it only just that, a terrorist attack. They would have anyone believe that there are no monsters, but what few survivors there were knew what they saw. The nuclear strike was not by the hands of radical terrorists but instead the attack of a giant armored lizard.
Following the attacks, Tower City was forever changed. Angemon sent Digimon with Digivices on a one-way trip to the human world to find a suitable partner. He believed that only when Digimon and Humans came together could either achieve their greatest potential. Many digimon found partners, and the ones who couldn't and gave up settled in the Ruined District of Tower City where they wouldn't be seen by humans. The humans with digimon partners, also known as digidestineds, set off on many adventures, some sought rewards of peace and justice, while others personal gain.
The Zony Corporation, known worldwide for its production of digital electronics, was well aware of the Digimon threat. They created a unit known as DATA for the purpose of keeping the Digimon population under control and keep the secrets of the Digital World away from the public. This would become harder and harder by the day, as the longer children spent with their digimon, the stronger and larger they would become.
The future of the Real and Digital Worlds is uncertain, however each and every individual has choices to make and a part to play.