Here's the content of an e-mail I sent to the BX_Fanfic list shortly 
after the completion of Walk 4.  It's a set of notes that clarifies
most of the weird stuff.  I think.

Alex Dompeling wrote:
> 
> WOA, this is getting a little confusing... It's good
> though. Seriously hoping for a sequel.

It is confusing.  That's the biggest problem with writting a fic totally
from a single character's POV when there isn't going to be discussion of
the plot to show what's going on.  And I probably glossed over a good
bit in there somewhere, too.

Here's a summary thingie for what happened:

The god (who has no name, really) had taken over the weapon (the disk) a
long time ago, stealing it from the Hokage clan (a group of ninja who
created elemental weapons in order to fight, etc, etc.  The weapon is my
my own creation, though modeled after one that actually was in Flame of
Recca, and quite a bit more powerful than the majority) and possessing
it.  Something complicated happened and both were lost to the mortal
world for a while.

Some time after that, in the "time of civil strife", the Hokage clan was
destroyed by a Shogun intent on seizing their weapons.  Only a trio of
the clan survived, one of the Kagero (the asian woman we've met), her
son Recca (the star of that series, the show is so titled because the
leader of the clan doesn't use a weapon, but instead creates elemental
flame without one) and his half brother Kurei (an evil bastard who has a
pretty impressive flame of his own).  

Using the forbidden technique of time manipulation, she sent her son
forward in time to a world where he could live a normal life (today) but
Kurei hitched a ride (and tried to kill him).  For her use of the
forbidden magics, time cursed her never to die and never to be able to
touch the one she sent through the time stream.  Thus, if they ever try
to actually touch, there are sparks and it gets ugly (literally).

There was a long series of happeneings in which she wandered the earth
for a few hundred years, seeking her lost son.  She met Anya some time
during this (though it was perhapse earlier, when she brought vengance
upon the leader of the Hokage, Kagero's lover, on behest of his wife,
though I didn't write in enough for it to be concrete) and somehow they
became somewhat allies.

Then, may years later, some stuff happened, and Xander woke up the
demon.  Perhaps it was just an accident, or maybe more?  

After that, things went the way they appeared in Carve up until the very
end.  As the god/demon found himself strong (from consuming so many
souls) and in contact with something that was, for all intents and
purposes, a giant, living weapon, he made the decision to change his
home, possessing Adam and sucking Xander's life force along with him.

The disk, however, was too clever for him.  In it's long existance, it
had grown to hate the demon and hid Xander's true soul from the monster,
passing on only enough to make the demon believe it had drained him of
all life and soul.  Then, somehow, it compeled the husk to crawl its way
out of the compound where he was found and rushed to LA for treatment.

That's where Xander woke up.  Anya had recognized the disk from one of
Kagero's stories and went in search of her (which too a while,
considering she wasn't using that name), finally finding her in
California, of all places.  She and Fuko were on a quest to find the
missing "main body" of the Fuujin (lit, "wind god", Fuko's elemental
weapon).  

Then things happened the way they appeared, Kagero's Ekai ball used to
scry out Adam, and then they attacked, hoping to stop whatever he was
plotting.  He was intending to use Buffy as a "living battery" to power
a machine that would open a rift in space/time which would consume the
whole world.

The fight went on, and when it was over, the rift still grew, sucking at
Buffy's life force.  Finally, Kagero stabalized the rift with a version
of time manipulation, and they passed through, moving Buffy through the
rift and out the other side, cutting off its growth.

What happens next in the story is something of a mystery, even to me. 
Suffice it to say that I have a lot of decisions to make, one of the big
ones involving the "curse of time" which may or may not be leveled
against Buffy and/or Xander.

Oi, there, I think I answered all the weird stuff.  Hope it helps.

Tim