It appears that both Sayu and her mother are incapable of 'understanding how the other is feeling'... They both simply state their grievances and gnash their respective teeth while the other other doesn't acknowledge what they just heard. The show frames the mother as being fairly unsympathetic, but I'm not fully buying it- single mother raising two kids and one of them keeps 'causing trouble'. Its not a great look to tell someone they should have never been born, but we're all adults here; it should be understood that people explode and say things they don't mean sometimes. Our worst shouldn't define our whole, I believe. While I don't follow the platitudes that Yoshida spewed about who has the right to raise Sau, I did like the level headed handling of the constant disrespect the mother was showing.

As has become common, I have little idea what this show is trying to espouse at this point, but there's dramatic BGM and some character close ups, so I should feel something, right?

It was also funny that the mother double checked- 'you didn't do anything with my daughter, for real'? Does that change anything? If you knew how many partners she already had, would that change this situation? Weird.