Media Factory began streaming the first promotional video on Saturday for High School DxD Hero, the fourth season of the High School DxD television anime series.
The first anime adaptation premiered in Japan in 2012, and the second series, High School DxD New, premiered in July 2013.
The third series, High School DxD BorN, premiered in April 2015.
Author Ichiei Ishibumi and illustrator Miyama-Zero’s High School DxD light novel series previously inspired three television anime series.