Uma Musume: Pretty Derby - Shin Jidai no Tobira

ウマ娘 プリティーダービー 新時代の扉

The film follows Jungle Pocket, who wishes to participate in the Triple Crown Classic race, which can only be run once in a lifetime. She faces rivals Agnes Tachyon and Manhattan Cafe. (Source: Anime News Network) Note: Relations are provisional and will be updated when more info is announced.