As this fantasy-adventure continues, the tone darkens and links to battles waged four years earlier in ''.hack//Sign'' emerge. A cabal of kids known as the Group of Four are using illegal software to create havoc in the computer realm of the World. They try to eliminate Shugo, whose powerful bracelet can thwart their plans, but trap Rena by mistake. She joins the growing number of players who have vanished from the game--and lie comatose in the real world. As Shugo and his friends search for Rena, they encounter another foe: the Cerulean Knights, the enforcers of the CC Corporation, and their icy commander, Kamui. The stakes are being raised, inside and outside the World. The filmmakers juxtapose these threats with the bright, imaginative designs of the game world to create a engaging balance of danger and humor.