Played this game some time back so details are a bit fuzzy.
It starts with the protagonist going into a city getting a job for the first time or something like that. Initially it starts with him with a girl (IIRC his sister) in a restaurant/cafe, pretty soon afterwards he has sex with her in her apartment. I also remember that there's some paranormal/supernatural angle where this guy can see dead people or see their soul or something like that. I think later he sets up an office of a detective. I can't remember for sure, but I think the game is 2dcg. Also, I vaguely remember the guy has another sister.
It starts with the protagonist going into a city getting a job for the first time or something like that. Initially it starts with him with a girl (IIRC his sister) in a restaurant/cafe, pretty soon afterwards he has sex with her in her apartment. I also remember that there's some paranormal/supernatural angle where this guy can see dead people or see their soul or something like that. I think later he sets up an office of a detective. I can't remember for sure, but I think the game is 2dcg. Also, I vaguely remember the guy has another sister.