I finnished watching an anime called "Shinsekai Yori" (or "From the New World" in english) a few weeks ago. It is honestly the best anime i ever seen ^^. Its dark... Very dark, and way more depressing than any other anime i seen, in a good way (and one of the few stories, books, animes and stuff that has brought me close to tears). I would reccomend it to anyone who likes serious anime.