maybe this if u havent read?
https://www.mangago.me/read-manga/from_the_red_fog/
ill give it a try
ijimeru aitsu ga waruinoka, ijimerareta boku ga waruinoka
(Here's some you'd probably like)
Juujika no Rokunin
Shokuryou Jinrui
Shokuryou Jinrui Re (sequel to the previous one)
Misu Misou
Kamonohashi Ron no Kindan Suiri (not horror, more comedy, but has murder, mystery, suspense, and justice)
Zenaku no Kuzu
Monster
(These next ones are manhwa)
Superior Day
Save Me
Miss Guillotine
Bastard (hwang Youngchan) (has romance, can't remember how much tho)
Unhinged
Shit juujika is so good
Save me was so good too
https://www.mangago.me/read-manga/shin_ai_naru_boku_e_satsui_wo_komete/ Is one I recommend tok
ur taste fire
imma kiss yall gn thnk u
juujika jumpscare
PLSSS
anything similar to "Brutal: Confessions of a Homicide Investigator", mostly mystery, has a plot, "justice", suspense, could hav a little romance(a little of any other genre or none at all, dont mind) andd yeah :D(I rlllllyyyy need smthin to red off this site)