In the year 2007, an MMORPG (Massive Multiplayer Online Role Playing Game) known as 'The World' is released in the US and becomes insanely popular, spreading worldwide and reaching up to 20 million players. One day, a mysterious phenomenon occurs where all the monsters in the game become increasingly powerful and harbour otherwise unheard of abilities. Along with this, players are unable to make any progress with their characters. Naturally, these occurrences render The World rather unplayable, so a player who goes by the name of Kite decides to get to the bottom of it.
Each episode of .hack//Liminality was released with one of the original 4 .hack games and deals with events in the real world during the events of the games.