can anyone recommend a manga like killing stalking

Warehouse
Blood bank

Warehouse
Blood bank
If you hate me that much
Dark heaven
Unfather (?)

http://www.mangago.me/read-manga/raising_a_bat/
http://www.mangago.me/read-manga/geu_kkeute_issneun_geos/

Neither of them are as dark as KS, but they both deal with somewhat darker themes