Anyhoo...
I think that roll of film in chap 7 is really interesting.
Imma probably going to read too much into it but...
The first part of the roll is Yuki shooting pics of the guy from a position where it doesn't seem like he is aware of her.
The second part is Yuki throwing the camera to Akari and running off expecting Akari to chase and shoot Yuki from a postion of being pursued. She says 'shoot without even thinking about it'.
Kinda describes their relationships...