I like sad stuff

http://www.mangago.me/read-manga/dark_heaven/

http://www.mangago.me/read-manga/hate_mate/
http://www.mangago.me/read-manga/kowagaranai_de_soba_ni_ite/

http://www.mangago.me/read-manga/this_ending/

Good recommendation (。⌒∇⌒)。