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. A panel at the Fantasia Bunko Festival 2017 event had screened the video earlier on Saturday.

Yoshifumi Sueda (Rail Wars!, episode director for Gosick, MAOYU, So, I Can't Play H!) is directing the series at Passione (Haitai Nanafa, Hinako Note, Rail Wars!). Kenji Konuta (Blood Lad, Servamp, Library War) is handling the series composition, and Makoto Uno (The Qwaser of Stigmata, Rail Wars!, Love Hina) is the character designer.

Author Ichiei Ishibumi and illustrator Miyama-Zero's High School DxD light novel series previously inspired three television anime series. Tetsuya Yanagisawa had directed all three series at TNK.

The light novel series centers on Issei Hyōdō, a dim-witted, lecherous second-year high school student who is killed by a girl on his first date ever. Issei is reincarnated as a devil, and from that day forward, he serves as an underling of Riasu, a high-level devil who is also the prettiest girl on Issei's campus.

Ishibumi and Miyama-Zero launched the series in 2008, and Kadokawa released the 23rd novel on March 18. The 24th novel will ship on November 17.

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. FUNimation Entertainment released all three series on home video in North America.