User blog comment:B214/High School DxD EX/@comment-28324378-20160428020146/@comment-26345952-20160428023745

No it is not. There hasn't been an official anouncement of a 4th season by the author nor the studio that produces DxD. This are fake rumors. High School DxD Ex is just a side story from the LN, not the plot of season 4.

In fact, where did you get this info, if I may ask?