That Time I Got Reincarnated as a Slime: The Movie - Scarlet Bond
An isekai film that explores the genre's tropes with its own unique spin.
In Raja, a small country located to the west of Tempest. Rimuru and his companions get involved in a long-running conspiracy that swirls around the mysterious power of the queen. Rimuru and his commander Benimaru also encounter another ogre survivor named Hiiro, a man that used to be the brother of Benimaru. (Source: ANN)
Plot summary from MyAnimeList. Data and images via Jikan API.