Unless she really is Reimi, I don't know. She just looks like... well, a generic Taka Tony girl. Which is quite attractive, mind you, but still very similar to a dozen other girls he's drawn in the same style.
So I really have no idea. If it came in the same Bamboo Blade book then I guess it could be, but there are other pics as well in the set that don't seem particularly BB-ish either.
Hello all, apologies on this. I'm not sure whether she is from Bamboo Blade or not as I have not watched the series, but I was reliably informed that the majority of the other art in the book that this came from was of Bamboo Blade characters.
Please feel free to remove the tag if you are sure it is incorrect of course...