HORROR // PSYCHOLOGICAL
> Brutal: Satsujin Kansatsukan no Kokuhaku
http://www.mangago.zone/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/
> Pumpkin Night
http://www.mangago.zone/read-manga/pumpkin_night/
> Kichikujima
http://www.mangago.zone/read-manga/kichikujima/
> Prison Lab
http://www.mangago.zone/read-manga/prison_lab/
> Tomogui Kyoushitsu
http://www.mangago.zone/read-manga/tomogui_kyoushitsu/
> Fukushuu Kyoushitsu
http://www.mangago.zone/read-manga/fukushuu_kyoushitsu/
> feeding lamb
http://www.mangago.zone/read-manga/feeding_lamb/
> Kami-sama, Ki-sama O Koroshitai.
http://www.mangago.zone/read-manga/kami_sama_ki_sama_o_koroshitai/?83z4
> Jinrou Game
http://www.mangago.zone/read-manga/jinrou_game/
> Jinrou Game - Beast Side
http://www.mangago.zone/read-manga/jinrou_game_beast_side/
> Jinrou Game: Crazy Fox
http://www.mangago.zone/read-manga/jinrou_game_crazy_fox/
> Funouhan
http://www.mangago.zone/read-manga/funouhan/
> Tenkuu Shinpan
http://www.mangago.zone/read-manga/tenkuu_shinpan/
> MADK
http://www.mangago.zone/read-manga/madk/
> Homunculus
http://www.mangago.zone/read-manga/homunculus/
> U12 (Under 12)
http://www.mangago.zone/read-manga/u12_under_12/
> Apocalypse no toride
http://www.mangago.zone/read-manga/apocalypse_no_toride/
> Save me
http://www.mangago.zone/read-manga/save_me/?yZNC
> Uncomfortable Truth
http://www.mangago.zone/read-manga/an_uncomfortable_truth/?F8kz
> PigPen
http://www.mangago.zone/read-manga/pigpen/
> miss guillotine
http://www.mangago.zone/read-manga/miss_guillotine/?YJEb
> Sweet Home
http://www.mangago.zone/read-manga/sweet_home/
> Bastard
http://www.mangago.zone/read-manga/bastard_hwang_youngchan/?MMYm
HOPE THIS HELPED
Very good horror with barely no romance or harem?