Yeah there's this suspense about her, did she do this purely wholesome or there's hidden darker intention? Also what's with sensei? What's her real goal here?
We did get a hint that something is amiss with her family because she apparently lives alone in that apartment and we never saw her parents or mention of a sister. It's certainly there.
What the heck? The sister seems sane when we saw her and the wife doesn't seem to have ill will towards her?
Edit oh I misread it's her sister not his sister.