I really loved the firts season, eventhought can't really deny it's flaws, especially the weak plot.
I really hope the show will evolve to something a bit more plot driven, if it happens it will no doubt evolve around those monsters (mamono). After ep 5 & 6 I'm really getting my hopes up, I mean these new character must have a point of somekind (right?). I guess I was a bit of dissapointed how fast Devil king was demoted to punch line, must be somekind of record. But it works in it's own way, well see I there is any point to him. The hero chick way of speaking is really annoying thought.
Ep 5 had me to worry that the show would become a monster of the week kind of plot, but I doubt it will happen.
Also I was too really suprised about amount fanservice on second season, this has already raised to the ecchi levels of manga version. Which btw should get a proper serialization even just for fanservice values.
And my opinion on Nanami and Becky...Well I had the privilage to listen a Drama Cd which featured them, so I grow to like them before the second season started. There was also some character development for them too, but none of it has been brought up in the show yet for some reason.
Who cares about character development when we can use that time for fanservice, right?
That said I can't say I'm happy that with these two around the original cast has much less screentime. No Eclair in two episodes? This is madness!
All in all I have really enjoyed the show up to this point, but last two episodes have dragged a bit. But maybe they are necessary for plot, if one actually exists.