Ok so, I read the WHOLE thing today, to have it fresh..there's an actual couple, a blooming (?) couple, an adult "couple"? and Ichinose and Natsuko who are... "friends" , and there is Aya? Ayu? I'm so bad with names, who seems to like Haruko for reals, I'd like to see more of her.
I don't really expect them to have an actual thing but it's nice to read this manga, they have plenty of cute moments and the other girls are also super cute/fun to read about.