The Manga seems to go on for fucking ever in comparison, but the end of the series wasn't so abrupt to suggest that it was canceled. Of course it was incredibly short, but it ended in no way to suggest cancellation. I guess they just stopped caring about it? Or maybe the manga wasn't being released fast enough to provide new material upon which to base the anime?
Who knows. All I can say is that if there aren't any more episodes, I might have to break my foot off in japan's collective ass.