That Time I Got Reincarnated as a Slime the Movie: Scarlet Bond

Rimuru Tempest, a slime who has evolved into a Demon Lord, becomes involved in a mystery surrounding the queen of Raja, a small country west of Tempest. The queen possesses a strange power at the center of a long-running conspiracy, and its secrets draw Rimuru into a dangerous investigation. Along the way, he meets Hiiro, a survivor of the Ogre race, whose arrival leads to an adventure that puts the strength of their bonds to the test.