When Taichi Yagami and his friends entered junior high, they lost contact with their beloved Digimon partners. However, Taichi's life is turned on its head when he receives an urgent plea for help from the Digital World. Upon arriving, he discovers that the Digimon are terrified of the mysterious Digimon Emperor, who prevents them from Digivolving. In the real world, Hikari Yagami and Takeru Takaishi find themselves in the same fifth grade classroom. They quickly befriend Daisuke Motomiya, who looks remarkably like Taichi, tech-savvy Miyako Inoue, and Miyako's neighbor, Iori Hida. Together, with their new "D-3" Digivices, they team up with Hikari and Takeru, who still have their original Digivices, to become the next generation of "Chosen Children." Their mission is to once again save the world from impending doom. Utilizing the power of the Armored Digi-Eggs, they must thwart the Digimon Emperor's sinister plan to control the Digitized Universe.