can anyone recommend me a manga just like Brutal: Satsujin Kansatsukan no Kokuhaku, please...

been looking for something like this too so im following :>

Kinda similar but isekai and fantasy, the mc here is not that op, too

https://www.mangago.me/read-manga/serial_killer_isekai_ni_oritatsu/

kinda similar that they kill and both have mind games :)

https://www.mangago.me/read-manga/funouhan/