In the movie trailer, it was hinted at that there would be an outbreak in the plot, as well as mentioning Sei Shōnagon as one of the characters alongside names such as Koretada, Tokinaka, Chikatada, and Takaie.
The film has been directed by Yoshihiro Katabuchi, who has written the script as well. Chie Uratani has been serving as directing assistant on the film, which has been translated as co-director in the pilot film. Masashi Andō has been appointed as chief animation director for the film. Akira Senju has been tasked with composing the music for the film, while Yūji Kaneko has been credited as art director on the project. In previous videos for the film, Toshiharu Mizutani was credited as art director.
In September 2019, Katabuchi founded Contrail, an anime studio that is currently producing a film. Manabu Ohtsuka from MAPPA is serving as Contrail 's representative director, while Katabuchi is a member of its board of directors. The company is situated in Tokyo's Suginami ward.