Metal Gear Online is a short comic included in the instruction manual for Metal Gear Solid 4: Guns of the Patriots. It covers a short narrative focusing on elements from the second iteration of Metal Gear Online. It should not be confused with the Metal Gear Solid 4 Instruction Manga, which is also included in the Metal Gear Solid 4 instruction manual, or the Metal Gear Solid 3: Subsistence Instruction Manga, which covered the online component for Metal Gear Solid 3: Subsistence.
A soldier arrives at Metal Gear Online and, after briefly being mistaken by his drill sergeant as being a newcomer, is scolded for going to the newcomer section instead of going to the Auto Matching Lobby as he should after the soldier recognizes the sergeant from his graduation. However, the soldier ended up joining them anyways due to the group getting an alert that they are to undergo a Team Deathmatch tournament, with their opponent being the strongest of the clans, the Shinobi clans. They then attempted to fight off the Shinobi clan with difficulty, with one soldier even fearing that they might get SOP-scanned. Eventually the soldier managed to dodge effectively enough for his drill sergeant to note it, with the soldier admitting that he played Metal Gear Solid 4 several times. The drill sergeant also admitted that some characters from that game (e.g Old Snake) might be appearing in it, with the implication that their presence will draw out the battle for a significant period of time. They then continue with their battle, with the soldier remarking that he'll post the results to his blog assuming he survives the deathmatch.