The year is 2017, and the servers of the popular video game "The World" are infected with a dangerous entity. You must hunt it down and destroy it. Experience the epic G.U trilogy that includes all 3 original .hack//G.U. titles, Rebirth, Reminisce, and Redemption. Also included is the original Terminal Disc footage that provides background and context to the events that happened in the previous .hack titles. Introducing "Cheat Mode": Begin the game with full stats to simply experience the story, or "Retry Mode" to retry battles without having to return to the title screen.

The story focuses on a player named Haseo who hunts a player nicknamed Tri-Edge who defeated his friend Shino and left her in a coma in real life. Haseo comes into contact with other players who know of Tri-Edge and wish to stop him. The reason for Shino and several other players falling into a coma is connected with AIDA, a mysterious computer anomaly that infects the characters.