^ I don't understand, what more do you need than a gay couple who is accepted by friends and relatives to let go of the "heteronormative undercurrent" accusation? The only thing I see that could perhaps justify such a claim about the manga's premise is the part about Kurumi writing about gay marriage.
However, considering that gay marriage supposedly got legalised only 4 years earlier, it really is something new and exciting, so I don't think that writing about it is that weird. Plus, the whole manga (and I would suppose her column as well) seems more focused on the "friend" rather than the "female" part of the title. It's about two friends gradually getting closer until they both realise that they are in love with each other and enter an actual loving marriage.
"Being open about not actually loving the person" tells nothing about heteronormativity, it's only because they got married as friends. You could have the same premise with a het couple and it would still be as weird as it is now (if you find this premise weird, that is).
does signing some papers and wearing rings actually, really make them any different than roommates? Legally, yes, but in any other sense, I don't see how anything changed.
Agreed.
And this is exactly what the whole manga is about! We just saw Ruriko finally expressing (sort of...) that she is not satisfied with how things are in the last chapter. It's not as if the manga is telling us, yes, this is how same-sex marriage is like. Quite the opposite, actually.
The one thing with which I wholeheartedly agree is that I'd like it to continue after they get together, but I guess we'll have to wait and see.
P.S. I was gonna write "until they both realise that they are in love with the other", but then I was reminded of all the other yuri manga I've read and reconsidered lol