The .hack//G.U. Games follow the story of an Adept Rogue named Haseo, known infamously as "The Terror of Death", that is hunting an enigmatic player known as Tri-Edge, to avenge his friend Shino. The storyline of these games are redone into a manga entitled .hack//GU+.
In his first adventure in The World R:2 the Adept Rogue Haseo was attacked by PKers but saved by a mysterious played named Ovan. Eight months later Haseo emerged as a powerful PKKer known as the "Terror of Death", hunting for a strange PKer known only as Tri-Edge who had placed his close friend Shino into a coma six months earlier. Finally encountering Tri-Edge Haseo was defeated by a strange attack called Data Drain. This attack reset his character back at level 1, however it also awoke a strange power that had been sleeping deep inside of him. This power, the ability to summon an entity known as Skeith drew the attention of a secret organization known as G.U.. As a new member of G.U. Haseo swore to find the truth of what was occuring in The World and find the truth about Tri-Edge.
The players of The World are in trouble as the AIDA problem becomes more dangerous. Anomalies and infection have occured throughout the game, even within G.U. itself.
- Hori created G.U.-themed PS2 memory cards before the launch of every game.
- Azure Flame Kite
- Piros the 3rd