The trailer uncovers the anime’s 2022 debut date.
The returning cast for the fourth season includes:
- Satoshi Hino as Ains
- Yumi Hara as Albedo
- Sumire Uesaka as Shalltear
- Emiri Katō as Aura
- Yumi Uchiyama as Mare
- Masayuki Katou as Demiurge
- Kenta Miyake as Cocytus
The returning staff includes:
- Director: Naoyuki Itou
- Series Script Supervisor/Scripts: Yukie Sugawara
- Original Character Design: so-bin
- Character Design: Satoshi Tasaki
- Animation Production: Madhouse
The anime TV arrangement transformation by Madhouse comprises of 3 seasons with 13 episodes each, with the first season circulating from July 7 to September 29, 2015. Two accumulation anime films recapping the occasions from the main season were delivered in Japan on February 25, 2017, and March 11, 2017, individually. The subsequent season ran from January 9 to April 3, 2018, and the third season ran from July 10 to October 2, 2018.