Tensei Shitara Slime Datta Ken: Soukai no Namida-hen

That Time I Got Reincarnated as a Slime the Movie: Tears of the Azure Sea

The second movie in the <i>Tensei Shitara Slime Datta Ken</i> series.<br><br>
Fresh off celebrating Tempest’s founding festival, Rimuru and his companions are summoned to the Sorcerous Dynasty of Thalion, a nation of elves, by its influential empress, Elmesia. But their well-earned rest at her private resort island is cut short when a mysterious girl named Yura shows up, kicking off a new adventure on the endless azure sea..<br><br>

(Source: Crunchyroll)<br><br>