This artwork appears on the cover of several diverse editions of a Japanese manga called Shigure by artist Ken Moonlight (ケン月影 題名). The cover illustration of this edition (after some cropping of Japanese text) seems to have been the source for our version of the artwork. Two different editions (with slightly different versions of this cover art) can be seen here in thumbnail, along with our cropped version of the artwork.
Image provenance by Bacchus at Erosblog.