Hello~!

Tokyo Ghoul (Manga) (plus Sequel Tokyo Ghoul: Re, ongoing)

Zankyou no Terror (Anime with 11episodes)

http://www.mangago.zone/read-manga/cut/
http://www.mangago.zone/read-manga/acid_town/
http://www.mangago.zone/read-manga/sora_o_daite_oyasumi/
http://www.mangago.zone/read-manga/sakura_gari/
http://www.mangago.zone/read-manga/g_senjou_no_neko/
also try mion list it has some good sad one in there too:
http://www.mangago.zone/home/mangalist/880/?filter=&page=1

http://www.mangago.zone/home/mangalist/215/

thanx ^^