a 26-episode anime series, animated by studio Bee Train, that sets as a prologue for the .hack//G.U. video games. It is the first .hack TV series broadcast in HDTV (1080i). It is set seven years after the events of the first two anime series and games. .hack//Roots revolves around an MMORPG game called The World R:2, also known as The World Revision:2 and serves a sequel to the original version of "The World".[1] Its original Japanese television run aired from April 5, 2006 through September 27, 2006.follows the tale of Haseo, a black 'Adept Rogue'(a class that can use multiple types of weapons) and member of the "Twilight Brigade", a small guild created within "The World R:2." In the year 2015, the CC Corporation's building burned down, and with it, most of the existing data for "The World." By splicing in data from what would have potentially been another game with what remained of "The World" after the fire, CC Corp. created "The World R:2" and released it in 2016, which is when the anime takes place. The main revisions in this release were that the game allowed for guild and PvP (player vs player) play.

Haseo logs into The World R:2 for the first time and falls victim to the PKers (player-killers) that reside within the game. He is saved by Ovan, who prompts him to join the Twilight Brigade alongside Sakisaka, Tabby and Shino, who are in search of finding "The Key of the Twilight." However, a popular guild named "TaN" obstructs the Twilight Brigade in its mission and is attempting to obtain Ovan's unique character data. The Twilight Brigade has discovered special items, known as 'Virus Cores', and believed them to be the path to finding "The Key of the Twilight" and went to find them all. Once the Twilight Brigade had acquired all 6 cores, the guild headed out to use them in one of the "Lost Ground"s, after figuring out that the two were connected to one another.

However, the group discovers that this was all a trap laid by the members of TaN in order to captu