Wasn't Nana supposed to join the club, uh, association, to get closer to Minoru? She was worried about the distance between them, had a serious conversation with her female friends, and then... nothing. It's like the author forgot about the whole thing. But then again, this is a zero romance series, so maybe all kinds of romantic relationships are kind of background chatter and aren't even meant to play any role in the story itself, aside from kind of making the characters more human. But all development is always left at the intention level, kind of like in slice-of-life 4koma.