I don't get one thing. Back in Japan she was committing murders basically non-stop just to keep her brother to herself. But somehow or the other, either no one seemed to notice or no one was smart enough to show up with cops. I mean if I was there and my child or relative (or even my neighbor, for that matter) went missing like that, I'd call the cops. And once the cops are involved, you can be sure that the murderer will be brought down. She can't exactly bring down the entire world on her own, can she? e.g.- cops show up, get killed, this gets reported (it should be, at least as far as I know) and better cops show up but (somehow) also get killed. Eventually, it will reach a point where she can't kill everyone, like if the military shows up to rescue. But I suppose this is what you would call the power of plot armor