Well, was hinted at previous episode, and thought made blantantly obvious this episode.

The reason for the demon existance does interest me, Tokki 2nd div seem to just go with demons, however at the mansion old chap was going to go into some detail before Shindou lost temper.
I know their reason isn't going to be akin to saving the world, and they'll turn out to be the 'good guys', still nice to see some reasoning other than minions of evil.