Vulgar Ghost Daydream by Okuse Saki & Meguro Sankichi
Written by Saki Okuse and illustrated by Sankichi Meguro, the story revolves around Misaki Saiki, a young albino who works in an SnM bar. Once in a while, her father, a government official, would ask favors from her to look through supernatural cases as a spirit medium or necromancer.
Together with her 'bodyguard' Souichiro and her stalker Mitsuru, they get rid of ghosts who haunt government land and other places, but the main arc is about Yuo, a mysterious person who is the cause of several suicides.
ah.. am not that good with this...
just check the wiki article
truth be told, reading this manga was the first time I ever got scared from reading a book. Real spooky stuff, plus there is this certain element that makes the stories seem real. I guess it's because the characters are very 'human'.
the stories are centered on abuse; self loathing, murder, bullying, and other stuff that lead to suicide -- reasons why a spirit can't rest in peace. it also contains a lot of nudity and graphic violence.
so, obviously, it's meant for mature readers only ^^