@PMR: That's a common question. The manga itself is completed, but the translations are still catching up to the final chapter. If you can read Japanese, you can find the entire set online somewhere.
@mantaggsogg: Seems like the anime and manga end at around the same place. The current chapter takes place during the second-to-last episode of the anime.
This was the first manga I read (By chance, since I was looking for hentai... ehm). While not a masterpiece, it was enough to captivate a virgin to the medium, so I guess it's quite good.