https://www.mangago.me/read-manga/yakusoku_no_neverland/
psychological, with supernatural elements, and pretty much horror
https://www.mangago.me/read-manga/juujika_no_rokunin/
assasin/ bullies
https://www.mangago.me/read-manga/when_night_falls/
assasin
https://www.mangago.me/read-manga/pumpkin_night/
more action packed
https://www.mangago.me/read-manga/from_the_red_fog/
mc is crazy
https://www.mangago.me/read-manga/madk/
it’s yaoi but definitely read it cause most of the story is definitely that psychological horror vibe with a supernatural setting
Phantom Tales of the Night
Mononoke (this one also has an amazing anime)
Route End
Pet Shop of Horrors
Kiriko
Shokuryou Jinrui
Shokuryou Jinrui Re (sequel to previous one)
Mail
Death Sweeper
Ajin
Funouhan
Mononobe Koshoten Kaikitan
Ibitsu
Misu Misou
I wanna read some supernatural, horror manga. Psychological horror is fine as well. Ah no junji ito please