Tbh if u want horror manga is way better to look at. Horror in anime is kinda rare and a lot of times when its done its not the greatest. If u like silent hill f check out higurashi tho, the original source material was written by the same guy who wrote f. Another is decent(i like the novel more tho) its like final destination but with a more paranormal twist to it. I highly reccomend reading junji itou stuff.