User blog comment:B214/High School DxD EX/@comment-99.228.188.32-20160221104902/@comment-26345952-20160221150709

There is no season as far as we know, and season 4 is not EX. EX is a side story of the main plot of the LN. Ishibumi nor any other official site have confirmed or hinted anything of a future Season 4.