The first season released in 2014 with 12 episodes will have a second season
while the last sesion of shingeki no bahamut orchesta concert was being the director of the anime adaptation Keiichi Satou announced that the second season is confirmed, but the release data it's not yet.
I don't know how is gonna be the argument : with bahamut sealed and Beelzebub dead
But one thing at least I could say : There is a powerfull demon who hasn't make her move.
