Wow, it's been a while, and this story is intense as always. I couldn't help but go ahead and read the raws...
Sato-chan is a murderer! RIP, friend-chan. We finally get insight on Shio-chan's mind and her past. There are quite a few chapters on her mom and her, and they were interesting. Mom-chan is too much of a precious child who didn't deserve what happened to her.
Sato and Shio finally get into a fight and talk it out (if it really counted), kind of developing, I suppose. How our protagonists met is finally revealed, and it was really really nice.
And we also get to see more into Sato too, like her relationship with her aunt and a realization on how she defines love.