That Time I Got Reincarnated as a Slime: Trinity in Tempest (Manga) 12

Thanks to Phos, Stella, and Nemu's behind-the-scenes efforts, Youm's coronation goes off without a hitch. But for the three girls from Tempest, their problems are only starting. They'll put Edgar's etiquette training to the test as they struggle to show the critical town residents that monsters aren't all bad.

Volume 12 of the That Time I Got Reincarnated as a Slime: Trinity in Tempest manga series by Fuse.