Under the leadership of the great creator god of the digital world: World Tree Yggdrasil, the digital world has entered an era of advanced digital development.

As a result, the data expanded to a point that the world could no longer bear. For the sake of the Digital World, the World Tree began to grow outward while suppressing the Digimon's endless desire to evolve.

The first world he came into contact with was a world called Ultraman Gaia, which was in danger of destruction.