A girl named Touka joins the Fairy Tail wizard guild to pursue her affections for Natsu Dragneel, who is away with his team on the 100 Years Quest, a mission that has remained unfinished by any guild for over a century. Juvia Lockser competes with Touka over her own love for Gray Fullbuster, leading them to bicker over various women who have shown interest in Natsu and Gray. When Touka mentions Briar, a suitor of Gray from the black magic cult Avatar whose name was never publicized, Gajeel Redfox becomes suspicious of Touka and rallies Juvia and Panther Lily to investigate her. Meanwhile, Natsu's team arrives on the continent of Guiltina to meet their client, Elefseria, a Dragon Slayer and founder of the world's first wizard guild, Magia Dragon. Elefseria reveals that the quest involves sealing the Five Dragon Gods, a group of surviving dragons that are each as powerful as Acnologia, with the reward of having any one wish granted. He sends the team to the port city of Ermina, whose citizens worship the Water Dragon God, Mercphobia. The team's arrival is witnessed by a horned man whose companion addresses him as the Water God.