 Ozaki sometimes referred to historical portraits from the series' time period as reference for her designs, as well as actors in Western films, mentioning that she referred to Brigitte Bardot's hairstyles while designing Anna Rochefort's hairstyles, and used Brad Pitt as the reference for Durand.Scriptwriter Shotaro Suga was contacted by Tetsuya Nakatake at the beginning of the project, and agreed to work with them when he was informed that Tow Ubukata and Kazuhiro Furuhashi were taking part in the production.He was unable to work on the project immediately, as he was also working on "Eureka Seven" at the time.