Chinese scans are available here (thanks to Jacob Collado for letting me know ;).
Japanese RAWs available here (NEW LINK thanks to !).
I couldn't download the file, though. It is terribly slow and it stopped halfway through. If someone manages to do it, feel free to upload somewhere and let me know.
Rough translations by bluesun available here.
So it looks like this is set in an earlier point of the story, when Yuuko is still "alive" and Watanuki still wears his glasses and maybe he doesn't even have half of Doumeki's eyesight.
Something is wrong with Watanuki… could this be a parallel story? Where is Mokona?
All in all, I am glad Yuuko is back… XXXHOLiC is weird without her.