Baccano, Monogatari, Kara no Kyoukai, and Haibane Renmei can be considered fantasy or horror. If it is horror you are looking for, you should definitely check out Higurashi, Psycho-Pass, and I suppose Another. Psycho-Pass is more like a cop-drama, but I feel like there is enough messed up crap happening that you would like it. I don't want to spoil Higurashi, but i'll just say you will need to stick with it awhile before any of the mystery gets cleared up. Another is a gamble, alot of people like it.... but, if you think about it too much the entire plot starts to unravel.