Yeah I also would have loved a time skip ending but this is also nice. It's sorta refreshing we don't know everything. How did baseball guy respond? Who knows. Does Kuroshiki sensei achieve world domination? Probably. It's way better than when it takes the whole manga to confess at the end then...
It's almost sad how desperate the sister is but then she start to talk about burning her sister alive then I feel only satisfaction that their family has been ruined. It would have been nice if she tried to redeem herself but oh well. I guess people who would throw a little girl in fire can't...
Tries to throw little helpless girl you control into sacrifice fire and fails. Okay, new plan! Let's try that again but this time the helpless girl is powerful and has the backing of a family full of supposed monsters. What could possibly go wrong?