Why do some of you have be so serious? Who cares of if its real or not... it's good story either way.
The story is highly plausible given how some of the PA's can be around non-Japanese workers.
In the case of the OP, taking precautions and keeping accurate documentation is the best defense.
If she's being moved away, then that should calm things down a bit. I'd only worry if she makes excursions to show up at your apartment, that's a bit worrying.
We had a PA here a few years ago, keyword here is 'had'. When we'd bring people over from other countries for short projects, she'd slice through them like a hot knife through butter.
She got through 5 guys before things came to a head and one of them filed a complaint... luckily she quietly went away.
I don't think she ever targeted me since I'm a local and not just here visiting...probably more trouble, she thought. haha.
Anyway....
If you're taking this story too seriously, you may want to back off of this thread and go read something else.
Ahh.... office dramas.