Read it next Still.
I agree with the comments so far about the rich/poor divide. While reading, I found myself warming to the four main female characters, but after finishing I can find lots of faults: Masako, while an assertive character, with a good head on her shoulders, was just too fickle at the end. Kuniko was just a common whore - I don't get how people can say they identified with her to be honest; Yayoi seemed unecessarily heartless, and too weak to have done what she did.
Yoshie, though, was the best depicted character, I thought. Kirino portrayed her life, caring for her two children, grandchild and frail mother-in-law perfectly, especially with her desperation for money to survive. I felt heartly sorry for her several times throughout the story, such as when her daughter dumped her baby son on her hands, and then when she (or someone else) stole her money. She was the only one who didn't seem to be focussed on greed of the four of them.
I wondered throughout, what the purpose of Anna was. And I expected Satake to kill her, actually. But he didn't, so I'm left with the feeling what maybe her only role was to illustrate that beauty isn't really enough to satisfy a man - at least in Satake's case.
The male characters did seem to be rather weak, but I warmed a great deal to Kazuo, and wondered why he didn't just go back to Brazil with Masako's money. Satake was just pure evil, but the ending, when Masako stabbed him in the cheek, and he was grateful, happy to die, was a little overdone, I thought. Jumonji (sp.) seemed a good all-round guy, but for someone with so many links to shady characters, he did seem a bit of a wimp when it came down to his trouble with Satake.
I, too, thought maybe Kenji's body was going to be put into the lunches... I was surprised that I didn't feel more sympathy towards Kenji too.
The "jobs", both the night-shift at the factory, and the cutting up and disposing of the bodies, were well-written, I thought. They were interesting enough to make me keep reading, yet gory enough to make me wonder why. But I agree with MC about the pace, it was just right. I'm glad I read it, and like MC and others, if it wasn't a BotM, probably never would have picked it up.