[Golden Witch Drugs]

Well... The whole Rudolf-Rika thing sounds a little bit too much for me... My own theory for those words are:

Spoiler for EP1 spoilers:

I think that some of the adults that were killed on the first twilight knew about it, at least I think that Rudolf and Rosa did. Since Rudolf said "I'll probably get killed tonight..." and Rosa came up with her "Please take care of Maria." And in the manga, you even saw a sweat drop on her cheek before she said those words.