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But the whole thing with SHINO is the real problem., Do they have cut scenes to establish who she is and why she's important enough for Haseo to take Tri-Edge head on?
And actually, they do show certain cutscenes/flashbacks, and through dialogue and all, you get to learn that Haseo is on a "quest" for that legendary PK known as Tri-Edge, as both revenge for putting Shino in a coma, and finding a way to "save her".
But you don't need to watch Roots to be able to understand GU properly enough to play it, and you won't actually be lost at all if you play GU without watching Roots (i played Rebirth myself before watching it and it didn't drive me away or anything...though i was already into the .hack fandom). Sure, by watching Roots you'll understand some things far better, especially all the referrences to the Twilight Brigade...but, you won't learn much more about the Epitaph Users and AIDA, nor meet people like Atoli, Endrance, or Alkaid, which all function as key plots in the GU series. So, even though they're pretty much following the same timeline directly, the plot on each one develops very differently and gives importance to very different aspects as well...so, you won't really miss THAT much by only playing the games and not watching Roots, unless you actually want to see a full view of the story.