TV special
Finished airing
1 episode
High School DxD Hero: Taiikukan-ura no Holy
High School DxD Hero Episode 0: Holiness Behind the Gym · ハイスクールD×D HERO体育館裏のホーリー
Characters and voice actors
Staff and studios
Ishibumi, Ichiei
Original creator
Sueda, Yoshifumi
Director
Konuta, Kenji
Series composition, Script
Miyama-Zero
Original character design
Nakanishi, Ryousuke
Music
Passione
Animation production