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That Time I Got Reincarnated as a Slime Film Reveals Theme Song, Insert Song Artists
posted on by Rafael Antonio Pineda
The official website for the insert songs "Jōka" (Purifying Song) and "SPARKLES," respectively.
All three artists have previously performed theme songs for the franchise's television anime.
The film's new cast will all voice new characters original to the film, and include (Note: Character name romanizations are not official.):

Riko Fukumoto as Towa, a queen with mysterious powers
Subaru Kimura as Lacua, a peddler that frequently goes through the realm of Razha
The film will screen the film in all major global territories (excluding Asia) in early 2023.
Fuse, the author of the original light novel series, drafted the film's brand-new original story. The story will center on a new country named Razha (Note: Name romanizations are not official), located to the west of Tempest. Rimuru and his companions get involved in a long-running conspiracy that swirls around a woman with a mysterious power. Rimuru and his commander Benimaru also encounter another ogre survivor named Hiiro, who used to hold Benimaru in high regard.
The first television anime of dub.
The second television anime season premiered its first Tokyo MX in April 2021. After The Slime Diaries ended, the second cours of the second season began in July 2021 — for nine straight months of television anime from the franchise last year.
streamed an English dub.
Sources: Tensei Shitara Slime Datta Ken: Guren no Kizuna-hen anime film's website, Comic Natalie