I'm actually a bit disappointed after this episode. He's controlling Misaki through guilt? Really?
Good to see that while she allows guilt to push her to kill 5 billion people, she can find some solace in playing Kill Ballad (and geeze, despite feeling all that angst over Kai, she still beats the snot out of him at video games).
Everything begins to make sense after this episode (well, within the framework of the show that is; the giant robot aspect is so contrived, but I can overlook that).
The only real questions at this point are:
1) Why does KK want to kill 5 billion people? I'm hoping he has a somewhat rational-if misguided-reason that is revealed eventually, and that this isn't just a case of senseless megalomania.
2) Is Frau's mother still alive?