I would like to know as well
Psychological Yaoi with matter-of-fact sick concepts: Most of Harada's work. I actually found Killing Stalking in one of the comments there.
Other notable Yaoi/BL manga: Boys Next Door, To The Sea
Non yaoi but similar to Killing Stalking: Bastard
http://www.mangago.me/read-manga/itou_san_kuraka_sui/
Chapter 1 and 3 are pretty interesting: http://www.mangago.me/read-manga/haru_ni_kaeru/
Not too much like Killing Stalking but it’s a horror yaoi with a mildly terrifying plot: http://www.mangago.me/read-manga/samenai_yume/
A pretty dark yaoi. Personally I couldn’t get too into it but it was mostly because of the low quality of the scans. Maybe you’ll like it: http://www.mangago.me/read-manga/boys_next_door
This one? Someone just recomended this for me too and it's really interesting, a bit gore too http://www.mangago.me/read-manga/killing_stalking/
Thank you guys!!!!
Manga or manhwa like killing stalking, anyone??? I like concepts like that they're incredible (๑•ㅂ•)و✧