I have to say that, while this is a fitting ending, I'm kinda disappointed in the way the story shifted around chapter 12 or so to get us there. What I mean by that is, it felt like Kayo stopped being an active participant in the story when she started dating Satomi-san, most of what she did was react (or not) when Junko confronted her, go be worried with Satomi-san about her evaluation and finish that sale Satomi-san had been handling. For the most part, the focus was on Junko and her creepy faces.Ironically, the rape scene was a bright spot in the story because Kayo was able to throw some verbal jabs at Junko.
Also, unrelated to everything I just wrote, could someone explain to me why Junko got back in contact with Hashimoto in the first place? She was initially confused about Kayo moving next door without her being aware this was happening, which led to Hashimoto for some reason, but then Junko said she wasn't going to bother with Hashimoto anymore because Kayo wasn't planning on using her in one of her schemes, which brings me back to the original question, why did she got in contact with her?