Well, that's what happens if you don't think. Just run the other way, and if she's chasing you, just find the nearest police station. If she were to stab you in there, then it's mission accomplished since she'll get arrested and once you're conscience (if that even happens) you can present your case. Maybe she could be charged for the kind of stuff that she's been pulling, and if she's charged with attempted murder or murder in general, it's a lose-win or a win-win situation. But what do I know about Japanese law?