I finished a reread to refresh my memory of this manga, a detail I'm a bit fixated on is the fact that Asa's parents are an unmarried couple ('common law wife' used in the second chapter + they have different surnames). In this chapter Asa's mother is shown having an argument with Asa's dad in a flashback, which seems to be about whether they should get married for Asa's sake. With the way the panels are composed, I'm frustrated that it's a bit hard to work out who's saying what though. (page:
https://mangadex.org/chapter/787315/28) Like is Asa's mother saying 'It's for Asa!' because the panel is meant to be emanating from her mouth, or is Asa's dad saying it because the word bubble is closest to him?
The next line (line 2), 'when it comes down to it, I'm just not confident I can
have a family!' is imo the important one, if the mum is saying that, that's interesting as Makio also considers herself incapable of having a family, suggesting the sisters aren't all that different; if the dad is saying it, then it instead emphasises Makio & her sister's differences. For line 3: 'Then what have we been all this time? What are we?!' the bubble is closest to the mum & her mouth is open, so on my second look, I think the dad is saying line 2, though I originally thought the mum was saying it. So if that's the case, I guess the reason Asa's mum, otherwise somewhat strict & intent on doing things properly (from what little we've seen of her), was unmarried is because Asa's dad refused to commit.
This is all to say, I'm pretty interested in seeing what Makio & Minori's house life was like, eg what caused one sister to become so intent on saving face & living 'properly', to the point that Makio felt totally unwelcome wrt having anything to do with her own family. Minori must've felt a lot of shame from not getting married.