Slayers: The Motion Picture

The powerful teen sorceress Lina Inverse and her travelling companion and self-styled arch-rival Naga the Serpent, having reunited after Naga was (once again) hired against Lina, obtain two discounted tickets for a tour to the fabled hot springs of Mipross Island.

However, they discover almost immediately that those hot springs are fake and the island is controlled by a group of bandits.

The two heroines clean up the island from them but learn they have been sent by someone called the Great Master... this does not bode well for the intrepid sorceresses.