Takato Matsuki, a fan of the Digimon card game, finds a Blue Card, which transforms his card reader into a D-Power. His original Digimon creation, Guilmon, materializes into real life when his D-Power scans his drawings. Takato meets Henry Wong and Rika Nonaka, two other children who are partnered with Terriermon and Renamon, as well as Calumon and Impmon. As wild Digimon began roaming Shinjuku, the Tamers defeat them and defend the city. Using their D-Powers, the Tamers can Digi-modify through scanning cards or help them Digivolve. After each Digimon is defeated, their Digimon obtains their data. Meanwhile, Hypnos, an intelligence agency led by Mitsuo Yamaki, has been capturing the Digimon and sending them back to the Digital World.