Aki Tsunaki did the animated character designs and Yuka Yamada wrote the screenplay. Tohko Mizuno originally designed the new character of the Maihitoyo project, Suefumi Oono, but had no involvement with his development. She watched the movie with audiences and was in tears by its ending. According to flyers and interviews, the movie takes place after the animated TV series. The Demon Clan are absent in favor of establishing Suefumi and including Kotengu into its narrative.