Thank you for the advise mo fo with a fro. You were right I went there four times throughout the game and got four memories that included all of the characters from .hack//sign! ^_^
But I know what I'm talking about! If you were to look at the anime disk that came with the game you'd know what I was talking about. In the theme song in shows parts of the game. In the new server (the one that is unlocked in the beginning) I'm positive I saw transparent character's from Tsukasa's show and Kite(your main character) interacting with them.