Sorry for the late reply.
The other perspective memories unlock after watching the other perspective events. You can find those in the menu with the pink eye.
As for the missing memory, at night, with Hibiki and Otome.
Vendena
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You need to spend time with Fumiko or Satsuki, during different times of the day.
Talk to Fumiko, if time doesn't advance, talk to Satsuki. If time doesn't advance. Go to your room and skip time there. Then repeat again with both Fumiko and Satsuki.
You know you're doing it correctly if time advances (ex. morning > afternoon).
It's not that complicated. Just spend time with them at different times of the day.
I won't argue on your views of what NTR is or not. You can read about NTR in HERE. This game's approach is more into Polyamory, with one male and several females. I completely understand if you don't like it, though. And respect it. There are hundreds of amazing games in this site, mine not being for you is fine.