Shin Megami Tensei IV has a very solid world and history that it builds upon. In this game, unlike its predecessors, you’re treated to a world different from the one we live in.
The whole point of Digimon World is not to concentrate on the story of the game. Instead, it is to adventure through the Digital World and communicate with Digimon, say the game's creators.
Unlike the protagonist, who blazes through the Digital World, Rina was more “the second protagonist who watches over the events from the human world,” say the game's developers.
For the first several chapters of Project X Zone, the main group is beamed from world to world willy-nilly, each time growing as two or three new the fray.
The goal of Digimon World Re:Digitize Decode was to appeal to old Digimon World fans. The goal of Decode is to fine-tune that experience and make it even more "Digimon".