The Digital World has been peaceful and safe under their current server, named "The Yamato Server", but it's discovered that access between the digital world and the real world has been severed and a new server, named "The Doom Server". A team of digimon was sent in to discover the truth behind what has happened and never returns. You play as a member of a Digimon Security Guard and follow in their steps trying to figure out what is behind these drastic changes.
The gameplay in Digimon World 4 is similar to that of any other top-down action RPG, like Diablo. Each Digimon can equip many different weapons that give them various combos they can utilize in battle, as well as spells that are given out based on which Digimon you are using.