Hello! Sorry, when I made this game, I didn't plan out the gameplay very well so to get the character routes, you have to basically ignore the main goal of the game (which is to get as much money as you can).
To get someone's CG, you'd have to ALWAYS choose their job option (Marcus = Counter, Nichole = Delivery, Thomas = Kitchen, Adrian = Tables) during the playthrough in order to get their affection up! You can tell you're leading up to the CG cutscene when little cutscenes happen after you're done with the day's work. And then once they reach a certain point (60 friendship pts I believe), another cutscene will trigger and you have to choose the correct answer to unlock the CG cutscene.
Technically it's possible to get a CG without always choosing their job option, but it helps :'D (If this still doesn't work, please let me know!)
Thank you so much for playing Lucky Days ;w; It's my first game and I know it has a lot of problems, but it means a lot to me that you're having fun!