User blog comment:MrCents 04/For the Second Season/@comment-26932361-20151010221709

If there were to be a second season, it would probably be Vol.4-6, however I do hope that they stretch it out all the way to Vol.7, because during Vol.4-6 Ainz barely showed up and it was mostly other characters perspective which might annoy people who watch the anime as the main character of the series barely gets screen time, so they might increase the number of episodes to include Vol.7.