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IM NOT GOING TO HORNY JAIL asked a question

So basically they are both detectives, in the first mission we see the brown haired guy is in disguise as a male prostitute, I forget what happens a bit but then the black haired guy fights all the enemies. And this other mission I remember is that they have to go to a club which is selling an illegal drug. There's a guy that works there that announces that there's a competition for couples. Both of the detectives pretend to be a couple to try and win the expensive watches. And then there's a guy that drugs a girl or something. PLSS SOMEONE PLS HELP ME FIND THE NAME OF THE MANGA PLLLLSSSS