I've seen enough hentai to know where this is going. But seriously: I really dig this one. It seems like there's a huge story behind it or that it could have one. I'd really like to see it in a movie.
The mask thingies at the top, the ones with the simplest faces, remind of the little spirit dudes from Princess Mononoke. (And I say that in the best way possible 'cause I know some people despise it when you compare things they do with other things you've seen.) So yeah, point is: this whole illustration is super awesome.