There are only 40 chapters out and they come out at a monthly rate, a very slow release, but the chapters are about 50 pages long. There might be just enough material for a first season.
Here's the trailer:
http://www.youtube.com/watch?v=KKzmOh4SuBc
While the manga is more focused on mystery and gore, i find the anime to be equally good but in a different way.
Oh, here's a video that allows you to post comments if you have a comments writing fetish:
http://www.youtube.com/watch?v=7KsnGRlhaTk
