I guess the reason why she eventually gave up is that she still lacks trust into Naoi.
Remember the moment when she waited near the theater for her to come. But because Naoi was still late Kurumi began to think that Naoi is just kidding which, at the same time, saddens her. Not just that but...
I guess both. I can‘t tell quite well what exactly happened but she definitely beat Kokoro with some item (possibly chair). To the head because we see that Kokoro lies on the table, saving Naoi.
Kurumi could faint simply out of shock of what she just had to deal with
Commenting quite late but I believe that she did have some romantic sympathy towards her when she felt „anxious to see her“ before the night date and calling it a dare herself. More like she felt jealous that someone Naoi could barely know already got so close while only keeping a distance from...
Hey, what about Azuma or Akane?
On the other hand I feel like Azuma is another victim, but this time victim of being abused by her “frienda” (Mine and Isanuma). Especially in that karaoke scene and in school after meeting, where she was just left behind on her own.
Akane is a single bright...
Yeah cause Kurumi definitely has her crush on Naoi developed, especially if you remember how she was “anxious to see her” and couldn’t wait for that moment before they went for that night date