The visit to see Asako's sister felt rather rushed considering how much of an impact her departure had on Asako. I'd expected the conversation would last most of the chapter and perhaps show Asako being a bit more conflicted about whether to forgive her sister for leaving with hardly any word and basically no contact since then. Additionally, considering that Yuuko went to great pains to ensure her and Asako's father didn't find out about the letter or the meeting, I would have thought the conversation would have mentioned their father.
That being said, I did like how Nagi gave Asako a figurative and literal push to go see her sister after all this time, even if I wish the story could have given more time to the reunion between the sisters.
Incidentally, it's a bit surprising that out of Shio Usui's work, this series has black-bordered panels for flashbacks, like most manga do, rather than for night scenes like Doughnuts Under a Crescent Moon and I Married My Female Friend do. I found the way she did that in those two series to be a nice stylistic deviation from other manga.