Harada
Well I've read her stories too
So- It's not a well-known manga- But I can give you this to read: http://www.mangago.me/read-manga/zankoku_na_kami_ga_shihai_suru/
I'm not sure the mangaka has uploaded anymore, but this story might be what you're looking for in terms of fucked up stories- Except, I didn't really find it all that fucked up, to be honest. It's pretty long, but if you've got the time then go ahead and give it a go.
kuraka sui
Thank you guys ヾ(☆▽☆)
Nakamura Asumiko
Looking for mangaka who writes such screwed up and perfectly fucked up stories as Ogawa Chise ╥﹏╥ with equally cool art ;-;