While I'm not trying to rain on your parade, companies like Bandai tend to keep rather strict positions on copyright. Generally, anything that's derivative of their work, unless it's a parody, isn't permitted without their permission, which, chances are they won't give.
If you're willing, you should probably try shifting it to something along the lines of the same idea, but not using any copyrighted ideas. Try to avoid stuff like "The World" being the particular world of the .hack series, or the use of any of the characters/organizations from that series.
Just a heads up
