I know that manga very interesting! (I'm on volume 9)
So far there are only 9 volumes and it is still a on going manga in the country were it is being released. You can get the rest of what has been scanlated (volumes 1-8) here:
http://www.ytbypass.com/browse.php?u...oLw%3D%3D&b=61
Enjoy, definitely a good read!