As far as manga, there are few in touch with the darker human elements than Junji Ito. Black Paradox is comedic, morbid, and by the end, fatalistic, but though entertaining, knowing nothing about the characters makes it hard to invest in them.
The Liminal Zone, created, written, and illustrated by Junji Ito, is a collection of short horror stories. From Viz Media, with translations by Jocelyne Allen, lettering by Eric Erbes, and cover by Adam Grano, the stories are stand-alone without connections between characters. Traversing transition from one state to another, The Liminal Zone lives up to its title with a dreadful cohesion by a master of horror. Junji Ito can squeeze eeriness out of anything.