Couldn't find a topic about this one, in the master list or through the search engine, so here we are.
This is another rather promising show which started recently.
Summary from ANN (this is more like a summary of ep1, maybe it will take a little different course over time - but I couldn't find anything better now):
Review: In a land of perpetual twilight known as AmberGound, Gauche Suede is a Letter Bee, a sort of glorified postman, and the young boy Lag Seeing is the newest “package” he has been assigned to deliver. Lag Seeing desperately wants to find his mother (or the woman he thinks is his mother, as there is some suggestion that she might be a fake), who was cruelly and forcibly taken away from him to the capital, and so is not cooperative at first, but he is struck by Gauche's ability to use a special gun which fires “heart bullets” to kill dangerous armored insects, while Gauche soon discovers that Lag has an uncommon ability to use the special gun, too. During the course of a crisis, both get insight into the pasts of the other.
The first ep was pretty catching, so I'm giving this show a try. Basically the (probably) main characters and a little of their background stories were introduced, but the animation and plot definition so far make this show worth trying.
Gauche resembles Lelouch rather strongly (probably because of the VA? But the sister stuff helps a lot, you know).
Opening and ending are both, considering at least the audio side, very good (even though the op might sound a little gay, I like it o.O).
If it keeps up its current level from ep1, hopefully some good sub group will pick it.