Idk if it's similar but fucked up:
https://www.mangago.zone/read-manga/double_suicide/
The story is kinda interesting but please, read the warnings beforehand:
https://www.mangago.zone/read-manga/hankon/
https://www.mangago.zone/read-manga/stalker_s_game/
https://www.mangago.zone/read-manga/hollow_portrait/
https://www.mangago.zone/read-manga/90_days_for_the_delicacy/
Probably my favorite horror oneshot (mild on the horror imo):
https://www.mangago.zone/read-manga/host_in_down/
And then this one if you want something more dark and depressing:
https://www.mangago.zone/read-manga/heartless/
https://www.mangago.zone/read-manga/kiseki_to_amedama/
(Anything by that author, just look at their other works)
https://www.mangago.zone/read-manga/oni_wa_warau_ka/
(Not horror, just fucked up)
https://www.mangago.zone/read-manga/koisuru_psycho_no_shirayuki_kun/
https://www.mangago.zone/read-manga/sankaku_mado_no_sotogawa_wa_yoru/
(Not gore, just supernatural)
https://www.mangago.zone/read-manga/kansai_jin_to_hukuman_satsujinki/
https://www.mangago.zone/read-manga/period/
(Oneshot)
https://www.mangago.zone/read-manga/90_days_for_the_delicacy/
https://www.mangago.zone/read-manga/love_me_eat_me/
(Haven't read these two yet, but there's cannibalism tag)
https://www.mangago.zone/read-manga/sleeping_dead/
(Horror bl - prequel -> https://www.mangago.zone/read-manga/living_dead_asada_nemui/
Asada-sensei's other works are also psychological)
https://www.mangago.zone/read-manga/eat/
(Vore | it's on the lighter side | furry ftw)
Harada's stories are more on the psychological side if you want some fucked up plots
Cannibalism & BL: https://www.mangago.zone/read-manga/feeding_lamb/
in the mood for something like madk. dark, gruesome, just fucked up stories with PLOT. the bl can be an underlying subplot. I just want to read stories like that rn. thanks in advance!