Fairy Tail season 5 episode 18
Episode title: Seven Dragons
Seven dragons have invaded Crocus from the ancient past and are tearing up the city. It seems the only thing that can defeat a dragon is a Dragon Slayer, but there are only six in town (including Natsu, Rogue, Sting, etc.), so Doranbolt goes on a mission to enlist the aid of a certain nefarious Slayer...
