How strange. As I said, that bug isn’t happening to me. I’ll try to investigate it anyway. At least I’m glad it has a solution.
Oh and another problem that i seem to get is after speaking to ayano for 1st time in her shop when she gives the box for free is my timer just freezing up and only moving turing chatting with kuro and others and the npc's plus when checking at what times the stores are open. Can't seem to even trigger heart events. Maby im just really unlucky with the game messing up on me.
I’ve fixed the interface issue when talking to Ayano, sorry about that.
As for the bug where Hana becomes invisible, I’ve searched everywhere but can’t find the cause — I don’t know why it fails.
Regarding the black heart events, they trigger as follows:
Aiko: by going to her house after 7 p.m.
Aoi: by going to her shop when it’s open.
Kuro: by going to her shop when it’s open.
Those are the girls I assume you’ve already unlocked