Digimon World 4 PC

The
game's protagonists are members of the "D.S.G. (Digital Security
Guard)". Based on Digital Monster X-Evolution, it is immediately
revealed that a computer virus known as the "X-virus" is spreading
quickly and is infecting many Digimon. "The Yamato Server" has
disappeared, and a new server known as "The Doom Server" has taken its
place. They are sent to the first area of the game