https://www.mangago.zone/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/
https://www.mangago.zone/read-manga/dareka_o_norawazu_ni_irarenai_kono_sekai_de/
https://www.mangago.zone/read-manga/efforts_never_betray/
https://www.mangago.zone/read-manga/zankyou/ (ig this one kinda has romance but it's relevant to the plot so...)
https://www.mangago.zone/read-manga/massacre_happy_end/ (again has some romance but it's relevant to the plot)
Carnby's work tho again some have romance
Save Me (korean manhwa) : a psychopathic new student wants to be friend with a disabled student who is a victim of a bully. Very stressful
Dokgo (there's prequel & sequel) : a model student died of suicide and his twin came in school as him to find out who bullied his brother (psychological & action)
Peter Pan (Korean Manhwa) : peter pan literally came to visit victims of bullying and gave punishment to the bullies (really gore and cruel, very psychological)
Have to recommend https://www.mangago.zone/read-manga/liar_game/ which actually got me into psychology
hello!! i'm looking for any psychology manga (no romance)