> I really hope the GXP novels aren't just a rewrite (or if they are,
> that they fill all the gaps and place all the nice background details).

The information I'm getting from sources is that the novels are a re-write of the
TV-series, however with more details and stuff that didn't make it into the anime.
As such, the first two novels supposedly only cover the first five episodes of the
TV
series. 


Tenchi Muyo! FAQ
http://www.astronerdboy.com/tenchi/  

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"Trigun"