Taichi arrives in a world called the "Digital World" where Digimon live. His classmate Sora appears there, and together with Taichi and Agumon, they begin their journey by heading for a "shrine".

Yamato’s team flies above an endless jungle on Birdramon until they come across a floating fortress. Sora’s caring heart that wants to save Digimon in trouble brings about a new glow on Piyomon.

Yamato’s younger brother, Takeru, is unexpectedly found in the Digital World, held captive by a powerful Digimon. With the help of Leomon’s army, Taichi and Yamato attempt to save Takeru.