I probably have stumbled upon a bug. The bug appeared in the cosplay convention event, but right after Ayame, Jack, and Robert finished talking at night (where Ayame and Jack bought a cosplay item). There's just a black screen but the BGM still plays in the background. This is just an assumption of mine, but can it be because I've hit Fallen two times?
I mean, I don't exactly remember if I have hit Fallen from Melvin or not. But if free roam content only comes after hitting Fallen, then it's probably true that I've hit Fallen two times, and that might be a problem. I did save on a bunch of slots as a checkpoint for if when I want to continue to another route w/o doing a new game. Just fyi, in the save where I encounter this black screen, I did Melvin first, unlock other jobs, unlock some free roam content (can't unlock all of them for some reason), and went to Sato route all the way.
I seriously don't want to do a new game just for Sato (cuz fuck that guy lol), but if I have to, then I guess I need to do it.