A four-panel comedy spin-off manga series by Bkub Okawa titled Hachi Nai Gaiden: Senryoku Gai!

[7] A four-panel comedy spin-off manga series by Bkub Okawa titled Hachi Nai Gaiden: Senryoku Gai!

[8] Another spin-off manga, titled Hachigatsu no Cinderella Nine S, written and illustrated by Kōichirō Hoshino began serialization in Akita Shoten's Weekly Shōnen Champion on August 19, 2021.

The series is directed by Susumu Kudo and animated by TMS Entertainment, with Jin Tanaka writing the scripts and Takayuki Noguchi designing the characters.

[15] The opening theme is "Etude" (エチュード) performed by Mewhan,[4] while the ending theme is a cover of Noriyuki Makihara's song "Donna Toki mo" (どんなときも), performed by Nozomi Nishida, Reina Kondō, Saki Minami, and Honoka Inoue under their respective character names.