Idk, Killing Stalking came to my mind when I saw what you want.
If u want an anime recommendation (which idk if there's a manga) I would say Higurashi naku koro ni
Hope it helps, Ive got softer ones but I'm not sure if it's what you want.
is super natural horror ok too?
Kisshou Tennyo
Manchuria no Opium squad isn't gory but I think you'd like it
(Some of these aren't super similar in terms of plot, but I think if you liked Brutal or Juujika then you might like these. Some of them are also manhwa's btw.)
Unhinged
Funouhan
Misu Misou
From the Red Fog
Bastard (hwang Youngchan)
Mononobe Koshoten Kaikitan
Route End
Zenaku no Kuzu
Superior Day
Doubt (tonogai Yoshiki)
I need more horror/murder mangas to read, anything similar to brutal satsujin or Juujika no rokunin (dropped this but it's an example) (=・ω・=)