The films are animated by POLYGON PICTURES with Kobun Shizuno (Fist of the North Star: The Legend of Kenshiro, various Detective Conan films) and Hiroyuki Seshita (Ajin, Knights of Sidonia) directing the films, and Nitroplus's Gen Urobuchi (Kamen Rider Gaim, Fate/Zero) credited for the film's concept and screenplay.
[Source: Anime News Network]