I think I found a bug. 2, in fact. Both related to violet. If you recall the violet event at the hospital from the shrine (this might possibly also happen doing the event normally) and choose to go home and possess someone (Eri seems to cause this, don't know about others) you have to replay through some of the prologue in a clearly glitched state. The other one is when you try to have violet possess Ai the game throws a bunch of Unicode characters at you and then acts as if no event took place. Very weird.
Update on the Ai part specifically, it seems to only sometimes be able to even show up. It most consistently shows up when accessing the list of characters from the hospital event but I remember getting it without doing that at some point. Very strange indeed.
Sorry to be so negative, I've personally been really enjoying this game (even as someone who is VERY asexual.) I'm looking forward to the next plot developments, wish you the best of luck.