Hey guys got some important fyi's since I'm getting close to completing the full game. Some of it is spoilers and some of it is not. The first thing is don't panic about scene unlocks. You never get locked out. And some of the girl's main scenes don't actually unlock until after you beat the main storyline. This is one of those games where about 1/3 of the content is actually after you settle things with the primary antagonist and see the credit screen. It's not just more harder dungeons either, There's loads of cool stuff and even h-scenes that are post game only. Overall the hints for the scenes are easy enough to follow. If you're wondering why the hell you aren't progressing. You probably need to just go ahead and complete the story. Or at least get further.
There is a point in the game where it warns you that your choice is significant. But does not tell you how it is significant. If you want to know ..
Additional spoilers ..
The aurum vendor quests (the blond outside your house.) Are important. They activate the aurum maid who accepts junk for key items. The first is additional medicine recipes. But the next is the pink card. Which after you show it to the blond will unlock the sextoy shop in your room. Gifting these is essential for unlocking some scenes. Her later quests also give you the missing materials for the ring of promise.
Once you have finished the game you should go to the soul training dojo or whatever it's called and accept their request. this will unlock a dungeon full of chickens which give stupidly high xp. And also unlock the area beyond that with the shrine of reincarnation. This allows you to do an NG+ and also reincarnate each character up to 3 times. Which resets their level to 1 but vastly improves their base stats. There is some fairly in depth endgame content in this game which basically requires doing this. And I'm currently gearing up to take a crack at that soon.
I know a lot of this is sort of available on the wiki. But it's pretty hard to read sometimes since google translate isn't totally accurate. So I figured I'd stick some major bullet points that would have saved some worry if I'd know them at the start.