this is very strange, Itsuki started coming around, but if she didn't know in the beginning, she surely realized who fuutarou is after seeing the picture in his wallet... is she feeling the pressure from her sisters?
Ichika's a snake, but her talk with Yotsuba's made her relapse to that state.
Yotsuba might still look like she's on the sidelines, but now she's gonna find out about Itsuki's side of things and she already knows the other ones.
Fuutarou had a realization while taking the picture and thinking about the past, but what is it?
Negi, you's a monster!
as it stands it seems like all the sisters are going through very different phases as follows:
Itsuki: desperation? not frantic, but she seems lost as to how to draw attention
Ichika: selfishness+treachery and maybe a bit of desperation too
Miku: depression
Nino: compassion
Yotsuba: pondering (all of the sides)