Nobody is interested in Yuna x Nena? SMH my head.
In all seriousness though, I like all the pairings. Ano and Yuna have obvious chemistry that doesn't really need to be explained. Ano and Nena are friends outside of their relations to their other friend groups, and obviously you can't be friends in a yuri story without becoming girlfriends at some point. That's the rules.
I kinda like the idea of an aromantic Nena though. She has no time for girls! There's very important sleeping to be done! :P
That said, Miki x Seina is the ship I truly love. Sweet soft gf x smol stronk gf is too good. And Seina has that one scene that everyone loves of course.