This is a gameplay of Digimon world 2. I will divide them into missions.
From the FAQ book: "The Digimon live peacefully on the Directory Continent. Recently, wild Digimon have begun to attack the city. The player which is you lives in Digital City and joins a Guard Team that is charged with a task for peace and security of the region."
At the start of the game, Akira your name finishes his last Training Mission and joins one of the Guard Teams (the player has the option of choosing between the Black Sword Team, the Gold Hawks team, or the Blue Falcon team). He receives missions from the Team Leader, which involve entering Domains and hunting down evil Digimon.