The Kurosagi Corpse Delivery Service, Volume 10

I started reading this for my Halloween Manga Reviews at Bureau42, before deciding to do Uzumaki by Junji Ito instead. However, I'm very glad I picked this up. It is definitely a horror manga (and I might consider saving it for next year's Halloween reviews - if it weren't for the fact that I want more people to read it), and it's very well written. If you consider yourself a fan of horror (or, for that matter, mystery stories), you should definitely check this out.