“.hack//Roots” 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. 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 capture Ovan. With Ovan gone and no sign of the Key of the Twilight, the Twilight Brigade disband and previous members, such as B-set and Gord, quit the game entirely. Soon after, Shino is killed within the game by a mysterious PKer named “Tri-Edge”. This somehow puts her into a coma in the real world, which devastates Haseo. Haseo then begins training in order to get strong enough to defeat Tri-Edge and save Shino from her real-life coma. Through this ordeal, Haseo becomes obsessed with power and ends up as a Player-Killer-Killer(PKK), in an effort to find information on Tri-edge. When Haseo competes in a special event that promises a special reward, he gains a new power, but his mind is corrupted and he begins to kill PKers with yet more aggression, gaining him the title of “The Terror of Death.”