User blog comment:B214/Volume 22 spoilers/@comment-73.46.6.122-20160720205153/@comment-9595671-20160721041644

The thing is that example is when the master was alive and peerage memebr died, Kuroka's case is the opposite. She's alive but killed her master.

We've never really gotten clarification on that, since her master made her a devil, wouldn't killing him have caused his entire peerage to die as a result? She's alive, so I feel there's something we're missing there.