.hack//Legend of the Twilight Series by Tatsuya Hamazaki

Old-fashioned role-playing games have experienced a renaissance on the World Wide Web. Twins Rena and Shugo are two middle-school students who enter 'The World' as level one game characters. When Shugo's character dies, he is transported to another level where he is entrusted to bear the Twilight Bracelet by the mysterious Aura. Shugo must find out who Aura is and why she gave him this powerful weapon to protect his sister from the peculiar characters in 'The World'.

What do you do when a game starts playing by its own rules? Shugo and Reina only recently started playing The World, the most advanced online game ever created, but they are already well on their way to becoming heroes. They've got a great party of friends, cool new items, and now they've been joined by Zefie, a Vagrant AI who acts outside the rules of the game... moreWhat do you do when a game starts playing by its own rules? Shugo and Reina only recently started playing The World, the most advanced online game ever created, but they are already well on their way to becoming heroes. They've got a great party of friends, cool new items, and now they've been joined by Zefie, a Vagrant AI who acts outside the rules of the game. As intelligent as Zefie may be, the CC Corporation isn't about to let an unstable element run free in The World -- not after what happened four years ago. So with the notorious debugging team, The Cobalt Knights, on the prowl, Shugo and company had better watch out! less

Shugo and Reina only recently started playing The World, the most advanced online game ever created. Now they're joined by Zefie, a Vagrant AI who acts outside the rules of the game. But the CC Corporation isn't about to let an unstable element run free in The World.

The Dot hackers are back, except with new players and a new story.