Sorry I posted my answers to the wrong section.
These are mangas that I don't really find messed up but it matches with what you are looking for:
Chi No Wadachi
Kasane
children
You Will Hear the Voice of the Dead ( I don't really think this is any psychological horror but the tags something otherwise)
Shokuryou Jinrui (Not really fucked up but ha...... reply
did dropped a manga or webtoon
