How do you get black rose in dot hack Gu vol 1?

You can't, it's impossible, she's not in the game, but, if you load your save files from .hack//Infection, mutation, or outbreak, you get an email from blackrose, and if you load ure file from .hack//Quarantine, u get a mails from Hokuto and Blackrose. Furthermore, if you load any of these save files, Azure Kite( supposedly Tri-Edge by Haseo in the beginning) his name will change to the one u chose in the from your old save files if u loaded them.