Fairy Tail: Dragon Cry

The King of Fiore summons Team Natsu to Crocus in order to entrust them with a very special mission: Zash Caine, a former minister of the state, has stolen the artefact known as the Dragon Cry and absconded with it to the Kingdom of Stella. Since Zash's goals are absolutely dangerous, as is his mind-control magic, the king wants Natsu, Lucy, Gray, Erza, and Wendy to go retrieve the staff. But infiltrating a foreign nation and going up against a particularly destructive wizard won't be easy – and the fact that this quest is wrapped up in Natsu's past won't make things any easier.

Synopsis from Anime News Network