Akisawa used to be an upperclassman from the school the club is from. He was a senior (along w Minami) when Akemi and Itome were freshmen. He was also part of the photography club. The chaperone teacher is someone he used to have a thing w back when he was a student (so teacher x student basically) . But the club members keep it a secret so long as he agrees to look after their club lolol. But yeah, they had a thing before for sure, but right now I think they just having a fling bc it seems like they don't see each other very often anymore bc of their jobs.
Ohh! you are righ!! now I remember, thanks!
I don't remember those sempais, are they a couple? Because I hope so XD