A mysterious Digimon appears in New York, using its special power to transport Taichi, Yamato, Sora, Koushirou, Mimi, and Jou to an unfamiliar world. Meanwhile, in New York, Hikari Yagami and Takeru Takaishi discover this Digimon and witness an American child speaking with it before running away. Patamon secretly follows and learns that the child is heading to a place called "Flower Field" in search of "summer memories." Everyone rushes there. Upon receiving Hikari's email, Daisuke and the others immediately board a plane to America...