seems like I'm stuck at prince's mansion. I've seen the scene where you ate dinner/lunch with the prince while he gave some exposition about Blood Crystal Key and Fragment(?), which I assume this scene comes after you completed the research.
After that scene, there won't be anymore maids that comes to my room so I can exchange stuffs/comission. And I don't even know how to progress friendship with Mia like the quest said after giving her Dusk potion thingy.
I'm at 1.04
the prince mansion has a number of bugs. you can probably make SOME kind of progress, but eventually its going to bug out. i suggest you try to provoke the boss battle against the prince, which you can just lose. which will bring you to an ending. and you can play new game+
by the 3rd or so playthrough, it should be fairly easy to get the virgin (True) ending, which you can then unlock all of the prince scenes that you have missed.
the bugs exists as of patch 1.05