I feel like Kisaki is lying or just doesn't know better on the last page. The real reason she doesn't say anything is that prejudice against other-than-us won't go away just because she blows up once or twice. That'll just result in more ostracizing. But, of course, she can't tell that to her kouhai who is too pure for the harsh social realities ATM.
It's been almost 3 years since chapter 1 and I feel this is going nowhere for now. I'd be glad to be wrong, but in my eyes, everything that was happening in the past, carried almost nothing into further chapters.
The high concept of this manga is basically "let's point fingers at Neeko's mental problems and laugh", so of course there is no development -- if she made any progress, the story would be over.
No disrespect to the translator's work, but I must admit, I read these chapters on fast-forward by now. And the only reason I still do is a vague hope that when the series eventually gets axed, the author will be gracious enough to give Neeko some kind of healthy resolution.
So the person in the hood is the hacker who's making robots attack people. Probably the voice in Anna's head discouraging her from helping. A human who hates robots (attacked like Yui)? A robot fomenting an uprising? Whoever it is will probably want to destroy Anna if they can't control her. This is getting deep in more ways than one.
I don't think she is a hacker, but rather a fellow android (perhaps even another human copy?). This chapter is basically a hint of why regular droids go on rampages: they talk to a human-like android and contract a "logic virus" that makes them first realize the depths of mistreatment they are subjected to and then question and eventually bypass the no-fighting-back restriction. The droid in this chapter was inspired to rebel by Anna, but I think the mysterious hoodie girl at the end was the origin of the previous outbreaks.
My theory: Hinako and her family (parents + older brother) were driving down a seaside road when their car crashed into the ocean and everyone drowned, except Hinako, who was helped to escape by one of them. Now she is suffering from severe depression and PTSD, but because this is Japan (or, at least, the drama manga version of it), mental health does not exist, so she is left to cope with her trauma on her own.
Slightly more far-fetched supplementary theory: A monster (perhaps even Shiori herself?) caused the car crash because it wasn't just Hinako who is extra tasty, but her entire family, that's why the monster let her go while it was busy eating the other three.
Okay. I know this is meant as a joke, but it's not very funny.
Very little about this manga is genuinely funny, actually. Not for someone who suffers similarly, at least.
I am only continuing to read it because I hope, against all hopes, for a healing conclusion for Neeko, even though it will most likely end with "and then Neeko got a job as an OL, got married with kids, and lived happily ever after" a.k.a. the way that the normative Japanese culture expects women to "grow up". :-/