User blog comment:Gary299/High School DxD BorN episode 4 review/@comment-15929029-20150426142417/@comment-1359322-20150426144652

Next season will have 26 episodes covering Volume 9, 10, 11, 12, 14, 16, 17, 18, 19 and 20. A total of 10 volumes into 2 cour.

Just kidding, next season will probably be back to 2 volumes per season. Volume 8 (Ex), 9 & 10 in Season 4 and Volume 11 & 12 into Season 5.