The Digital Accident Tactics Squad (DATS) is a government organization established to maintain the peace between the Real World and the Digital World, transporting any Digimon back to the Digital World. Marcus, a junior high school student, becomes one of the members for the organization. He learns that the Digimon Merukimon is opposing mankind. However, the past is revealed that scientist Akihiro Kurata was responsible for invading the Digital World. He gained the support of the government to oppose all Digimon species, claiming they were a threat to mankind. When Kurata uses Belphemon, Marcus defeats them. Before dying, Kurata uses a bomb to make the Digital World merging with the human world. While the Digimon BanchoLeomon prevents the collision, Marcus meets King Drasil (Yggdrasil), the supreme ruler who attempts to protect the Digital World by destroying mankind, since they cannot exist in both dimensions. Marcus learns that his father, Spencer, was trapped in the Digital World for ten years, because Drasil possessed Spencer's body and BanchoLeomon kept the latter's soul. After Marcus defeats Drasil, Spencer's soul returns to his body. With both worlds restored, all Digimon partners return to their own world. Five years later, Marcus and his friends embrace their future.