omg, the aneurisms, they keep coming :/

The ending scene was actually kind of badass, epic even. And ruined when Maou told Emi "Take care of her". Ugh. YOU ARE EVIL, YOU DO NOT SAVE!!1

Itīs ironic/sad how many of the things characters in this show casually say is what the audience has to wonder themselves.
"What kind of demon lord is he?!", outrageously asked by Emi, when she spots Maou being on a date.
Or in the very beginning when his underling tells Maou what he wouldīve done with the keys, and Maou answers with "Youīre a demon.", in accusingly manner.

ARGH!!!1

And this evil demon appearing here makes no sense. Maou is THE evil being, the evil of all evil.

Furthermore, and this might be too philosophical a stance for such a show, but anyway: It would NOT be a happy end, if Maou somehow ended up on the good side. Why? Because to him, being evil is NOT being evil. In his view, what he does is whatīs "good". And whatīs good for most of us, is evil to him. Good and Evil are switched, when itīs about the Evil of all Evil. Thatīs why I find it sad that it seems that heīs going to turn full-on good in time.
Itīs especially bad, since, again, the ending of this episode proved how fantastic this animeīs atmosphere could have been. Dat music.