The story revolves around a network game called "The World." It takes place four years after the "Twilight" incident chronicled in the PS2 game which shook not only the game world, but the real world as well.

CyberConnect Corporation (CC Corporation), the creator and operator of The World, held a "Limited Edition Character" campaign for The World players and its participants. The prize of the campaign was the Limited Edition Characters: the legendary "Kite" and "Black Rose" from the ".hackers" avatar that was prohibited after the Twilight incident.

A pair of twins in 2nd year junior high, Shuugo (the elder brother), and Rena (the younger sister), successfully obtained the Legendary Characters from the campaign. Shuugo, who wanted to quit playing the network game, once again set foot into The World under his sister's invitation.

In the game world, Shuugo and Rena met two other players, Mileyu and Houka, and they quickly became close friends after several events and encounters. However, the seemingly peaceful game world began to experience many weird changes which resembled that which occurred during the incident four years ago. This time, Shuugo, Rena, and their new friends are caught up in it...

*** thanks to Yagami Kaede for description, and cast & characters translation ***