Netflix revealed a new English-subtitled character promotional video for the Black Clover: Sword of the Wizard King (Black Clover: Mahо̄tei no Ken) anime film on Friday. The video highlights the evil Wizard Kings who will appear in the film.

The film is delayed from its original March 31 opening to June 16 due to the spread of COVID-19 affecting the film's production. Netflix will debut the film on its service on June 16. The film has a novel adaptation that shipped on Friday.

Original manga creator Yūki Tabata is serving as the movie's chief supervisor and original character designer. Staff members from the television anime are returning for the film. Ayataka Tanemura (Black Clover) is directing the film, Itsuko Takeda is designing the characters, and Minako Seki is composing the music.

Screenings for the film will give out the "Volume 23.5" bonus book to ticketholders. The book will have character designs of the film's original characters that Yūki Tabata designed, a short novel by film writer Johnny Onda, and an interview with voice actors. The book will be available as a bonus only for the first week of the film's release, and will be limited in number.

Toshihiko Seki will play Konrad Leto (English name romanization not confirmed), a former Wizard King. Actress and model Marie Iitoyo will voice the original character Milly Maxwell (character name romanization not confirmed). Fumiya Takahashi will play Jester, Miyuki Sawashiro will play Princia, and Houchu Ohtsuka will play Edward in the film.