The first manga I ever read wasn't actually manga at all because it's Korean (making it technically manwha). It was Min-Woo-Hyung's Priest about a monster hunter in the Old West who turns out to be something of a monster himself. It's good, spooky stuff with a ton of atmosphere.
Variety reports that Screen Gems is making a live-action adaptation of it directed by Andrew (The Amityville Horror) Douglas and possibly starring Gerard (300) Butler. Douglas and I have different ideas about what constitutes scary, but I'm holding onto some hope that it could be good. At least it's not Stephen Sommers.