When .hack//fragment went live November 2005, Japanese players were able to play this game as intended. One notable fan you may have heard of known as Crab, has created a site documenting their travels in .hack//fragment at brambling.net and has maintained the site to this day. Much of our knowledge and resource over the years has come from their website. And in light of their revival interest with the game, Crab will be moving the fragment section to a new link.
New Link: http://fragment.brambling.net/
Be sure to bookmark the new link as the old one will be removed in 1 month's time from now. And if you can't understand the site in Japanese, then Google has got your covered.