Franken Fran
Multiple stories, each with a plot twist at the end. MC is a hawt female version of Frankenstein. Very gory, imagine 'mad scientist performing gruesome experiments on her clients' only this time, the protagonist does so for the sake of 'helping others' and not for spreading terror in humanity.
Tokyo Red Hood
A very disturbing, twisted version of "Little Red Riding Hood". I dropped this early on but I plan on finishing it some other time. Not a big fan of the art. The gore is good tho, and the mc's messed up in the head so it ain't all bad. It's about a little girl's quest on finding "Mr. Wolf", whom she fantasizes on devouring her.
Hanako to Guuwa no Tera
SPLENDID! I thought they're just multiple stories but it ALL ADDS UP in the end. Definitely one of the BEST, storyline was done so well. Rec this one to those interested in Japanese urban legends and horror stories with a bit of romance ^^ The ending makes me want to read again. It's the same author from "Future Diary" so why not? :)
Murcielago
Exceptional in terms of gore. A bit explicit, has yuri 'scenes'. Not really scary? The MC is a psychopathic killer who agreed to work for the police and chase down criminals with her female partner/love interest.
Seeking for Death