So on page 1, we're supposed to infer that Sawako is telling Inui that she might be pregnant? I didn't realize that until the end- I thought she was just depressed, Inui conveyed that to Kishida, and then Kishida decided to pop the question. I guess her thinking she was pregnant makes more sense, but it wasn't really clear. Though an off-the-cuff proposal does usually mean pregnancy.
Also, I'm glad that this (probably) negates the chance of any love-triangle shenanigans with Sawako/Kishida/Memeko. That doesn't really seem like Munko's style or the direction the story was going anyway, but that one page at the end of volume 2 where Munko was being coy about Memeko and Kishida got me a little worried.