It was announced during an orchestra concert event for Shingeki no Bahamut: Genesis
that the series will receive a second season. More information will be announced later.
The original series was inspired by a mobile game also titled Shingeki no Bahamut, developed by Cygames. The original TV anime aired in 2014 from October 6 to December 29.
Source: Official tweet
News submitted by MisakaTheRailgun
Shingeki no Bahamut: Genesis 2nd Season