Re-reading the whole series was enjoyable, and also helped sort out what's been happening and who's who.
Also I feel disloyal but it's a lot easier to read on mangadex, with all-page load. Comment system sucks though.
So the couples:
Fashion/sleepy: apparently been together for a while now, no backstory yet, keeping it on the downlow.
Record club: not quite a full couple yet but getting there. Reveal that Pengin actually did remember the whole "she looks suicidal" bit of Airi.
MCs: Nekozaki seems to have let evidence and reason overwhelm her low self-esteem and self-loathing and is trying to reach out to Mikoto, but Mikoto is being stupidly useless enough for both of them.
Creepy pair: dating since Tsubaki was in middle school and Ms. was a teacher! Also Ms. has a wire on Tsubaki and seems to be part of a murder investigation of Nezozaki. Yes, I forgot teacher's name already. Tsubaki might have feelings for Neko or might just want to be an actual friend, I've heard that happens sometimes.