I've never really been into manga, but recently I came across the works of Junji Ito. Needless to say I'm hooked. These are exactly what I've been looking for in terms of frightening stories and imagery since I finished Scary Stories 3 by Alvin Shwartz as a child. All of his works can be found here. http://www.justmegawatt.com/comics/junjiito.html