The story follows Haseo, at first depicted as a PKK (Player Killer Killer) known as the "Terror of Death", a former member of the disbanded Twilight Brigade guild.

He is seen seeking out a PK (Player Killer) known as Tri-Edge, whose victims supposedly are unable to return to The World after he PKs them. Haseo's friend, Shino, was attacked six months prior to the events of the game by Tri-Edge, and the player herself, Shino Nanao, was left in a coma.

Haseo encounters Azure Kite (believing him to be Tri-Edge and blaming him for what happened to Shino) but is hopelessly outmatched. Azure Kite easily defeats Haseo and Data Drains him, reducing his level from 133 to 1 and leaving him without any items, weapons, or member addresses. He is left with a mystery on his hands as to the nature of the Data Drain and why Azure Kite is in possession of such a skill.

Eventually Haseo gains the "Avatar" of Skeith. Acquiring the ability to call Skeith and wield his abilities, such as Data Drain. With Skeith augmenting his strength, Haseo begins the quest for a way to save Shino.

Source : Wikipedia

.hack//G.U. Trilogy, announced on September 13th, 2007, is a a 85 minute CG animation being released on DVD and Bluray on March 25th in Japan. In additon to a straight-to-consumer release, a limited cinema run for .hack//G.U. has also been announced in Japan by CyberConnect2. Directed by the G.U. games director and CC2 president Hiroshi "Piros" Matsuyama himself, Trilogy will retell the story of the //G.U. games, with a new level of cinematic detail beyond what can be done in a PS2 game.

Source : dothackers.net

Full Trailer Download ( Subbed & Higher Quality ) :Link

Trailer 1 : Link
Trailer 2 : Link