Okay, before sending me your save file. can you try this?
- Save your game in a new slot
- Open the developer menu by pressing Shift+O
- Type in: jump q1
- Press enter and see if the next part of the quest triggers
You should either get a scene play out where the girls are talking about the black market. Or you should get the scene of you entering the shop at night. Please let me know what happened, cause it'll give me a good idea of what's going on :D
-Ex