I think Shimono Hiro nailed it as Keima. He had the mix of arrogance, otaku, and lady-killer well throughout this episode that exemplifies Keima's character. He had to hit all three aspects, and there was a definite distinction between the three. Itou Kanae as Elci (using the CR spelling) didn't fit as well as I hoped. She sounded a bit more mature and refined than I pictured Elci. It's still early though. I really liked Taketatsu Ayana (Azusa from K-ON) as Ayumi, a pity she's already out of the picture since they're jumping onto a rich girl next episode. Lastly on the seiyuu front, Tanaka Atsuko (Caster, Motoko Kusanagi) as the teacher was a very pleasant surprise. Perfect fit.

If I was going into this series cold, I'd have to say the first episode was very rushed. There was a ton of information crammed into those 20 minutes. Elci appearing, Ayumi's entire capture, and the introduction of Keima himself. A bit weak on it's own, but as a far of the manga it was very well done.

Great animation, good soundtrack, but totally meh OP.