One day, he goes to the park and sees his friends playing Digital Monster in a battle between MetalGreymon and MetalMamemon. After arriving home, he finds his mother's note, saying she would arrive home late, and hears a sound coming from his Digimon Pendulum, where a Koromon is calling him. He is then dragged to the Digimon World.
After waking up in the Digimon World, the Protagonist thinks he's dreaming, but then Jijimon tells him it's not a dream, and shows him his Partner. Inside his house, Jijimon tells the boy that he brought him to the Digimon World to save File Island, as its inhabitants were losing their memory. He then asks the Protagonist to take his Partner to explore the island, find the cause of the danger, and get Digimon to come back. The Protagonist then leaves before Jijimon finishes talking.
After entering in Native Forest, an Agumon attacks them. After he loses, and drops a sm recovery, the Protagonist invites him to the city, and he accepts.