Responses
If you mean like weird and gore then I guess @Lazu_ass_bitch got them listed but if you mean actual plot and fucked up ones then I suggest you check out Harada's works. I recently read Nii-chan and, yeah, it's bad. (Not sure but I think Harada just has crazy characters in her stories lol) and another one I guess killing stalking? Infamous so I assume you already know.
I want to read a messed up manga, one that's 100% dark with nothing cute about it. Give me something that is fucked up. I've been finding them on my own but I kinda don't know where to look for anymore.. any suggestionnnnss? Thankss