I don't own Justice League or Fairy Tail just any OCs I may throw in and unlike in the prequel so far nothing from the Harry Potter series will be there just mentioned. Justice League shouldn't play any part after Mass Extinction arrives on Earthland.
After a boat ride, the team, Wendy and Carla arrive at the Fairy Tail Guild. Wendy immediately thanks the guild for inviting her to join and is soon surrounded by the excited guild members who are thrilled with her cuteness and with Carla being a female Happy. Erza greets Makarov who congratulates them for doing a good job and tells everyone to welcome Wendy and Carla. Levy, Jet and Droy welcomes Lucy while Juvia welcomes Gray with heavy rain from her eyes. Meanwhile, Natsu is describing his fight with Cobra to Elfman, who doesn't believe him. Mirajane then welcomes Wendy and Carla, saying that Carla is like Happy and asking Wendy what her Magic is. Wendy is thrilled to see Mirajane, while Carla is not happy with Mirajane comparing her to Happy.
Wendy explains to everyone that she uses healing Magic and that she is the Sky Dragon Slayer. At first, everyone is stunned by the news, making Wendy think that they did not believe her. But after the initial shock, everyone expresses their happiness to know that she is a Dragon Slayer making Wendy feel right at home. Elsewhere, Gajeel notices that both Natsu and Wendy each own a cat, and wonders that since he is also a Dragon Slayer, he should also have a cat. Makarov suddenly announces that they are going to have a party to celebrate Wendy and Carla joining Fairy Tail. Everyone is having a good time. Wendy comments on the party being fun. During the party, Mystogan appears on the balcony but quickly disappears in a gust of wind after taking one look at Wendy.
A few days later, Wendy, Carla and Lucy are talking about Fairy Tail's Girl Dorm, Fairy Hills when a guild member bursts through the door saying that there is trouble. Suddenly, all throughout Magnolia, bells suddenly ring and Natsu realizes that Gildarts is back. Wendy asks Lucy who Gildarts is, Lucy replies that he was supposed to be Fairy Tail's strongest member, much to Wendy's amazement. The three then notice that Fairy Tail is behaving wilder than ever and Mirajane explains to them that Gildarts hadn't been to Fairy Tail in three years because he was doing a 100-year job.
When Gildarts arrives at the guild, he is surprised to see how much the building and some of his friends had changed. Natsu then, without hesitation, charges toward him for a fight but gets beaten with just one throw. He later talks with Makarov about the mission, and says that he couldn't finish it, greatly shocking everyone since he is their strongest Mage. He later leaves for his home, but tells Natsu to come over since he has something to tell him before accidentally destroying a wall while leaving.
Happy and Natsu head toward Gildarts' home and the first thing he asks is about Natsu's relationship with Lisanna, with the latter quickly becoming upset and telling him that she died 2 years ago before proceeding to leave, until Gildarts stops him and tells him about meeting a a black Dragon and how that Dragon forced him to quit the 100 year mission. Natsu tries to run away, since he believes that the Black Dragon might know where Igneel is and how he could find him, but Gildarts attempts to stop him, showing him the severe injuries he received when the Dragon attacked him. When he tells Natsu that no human could defeat the Dragon, Natsu angrily exclaims that he's called a Dragon Slayer for a reason and then runs off.
At first the two mistake him for Jellal who should have been arrested, but then he mentions that he only took the name of Jellal since he didn't know a thing about this world and this makes Wendy realize that this was the Jellal she met 7 years ago. Before they can receive an answer, Mystogan tells them to leave Magnolia since he can't stop Anima anymore and tells them that Fairy Tail and all of the town will disappear, but Wendy refuses to abandon her friends and tries to run back to warn everyone.
Back at the guild, everyone continues their routine inside due to the rain, but Mirajane and Elfman are getting ready to head out to the church since its close to the anniversary of Lisanna's death. Wendy, still trying to run back to the guild, notices a hole opening in the sky. She manages to make it to the guild but is too late, and the whole town gets sucked up along with the guild. Just as she is about to lose hope, Natsu suddenly bursts out from the wreckage. Mass Extinction just arrived after resting after fighting Oracion Seis.
Carla then flies to where they are and starts talking about a burden she has been carrying ever since she was born in the Earth Land realm. She reveals that she and Happy are from a different world and that the phenomenon that just occurred was because of a problem that their homeland, Edolas, is experiencing. The Magic of Edolas is starting to disappear, so they created Anima to transfer Magic from the Earth Land realm to Edolas.
he reveals that Happy and her were sent by the Queen to carry some sort of mission but Happy forgot about it and she chose to abandon it, still feeling burdened. Despite the dangers they may face, Natsu, Wendy, and Mass Extinction are still determined to go save everyone, and Carla, reluctant at first, decides to follow them after making a few conditions, which includes killing her and Happy if they do anything that could betray them. After making their decision, Happy and Carla use their Aera to fly through the remains of Anima and head straight through to Edolas to save everyone.
Flying through Anima, everyone arrives at Edolas, amazed that such a world exists. Shortly after, Happy and Carla's wings disappear and they fall in a storage building. After finding some disguises, Natsu spots a Fairy Tail guild mark outside the window and runs towards it. However, everyone's behavior there disturbs them.
Shortly after, Lucy spots them and confuses Natsu for their friend. Soon, Carla realizes that the people here are not their friends, but they are the inhabitants of Edolas. Realizing that their friends must be at the Royal City, they prepare to leave but then someone bursts in and tells them that the Fairy Hunter has located them. Shortly after the Royal army arrives, Fairy Tail manages to teleport away to another location. There, Natsu, Wendy, Happy and Carla learn that Magic is outlawed, Fairy Tail is being treated as a Dark Guild, and it is revealed that the Fairy Hunter is none other than Erza Knightwalker.
Clearing up the misunderstanding, Natsu reveals that they are from Earth Land, and that they are setting out to save their friends, with the others refusing to assist in such a dangerous mission. Along the way, the group bumps into a giant frog and tries to fight it but realize that none of them can use their Magic in Edolas. Luckily, they are saved by Lucy, who decides to give them directions and help them a little.
Arriving in Louen, Lucy takes them to a black market to buy Magic items that they can use to fight. Shortly after they purchase the items, the royal army locates them and Natsu instantly tries his new weapon, which produces a giant blade made from flames. His effort is made useless thanks to the shields that the army uses, and for overusing his already limited weapon in one use. Just then, Wendy accidentally uses her Magic item, which summons a giant twister and sends the army flying some distance, which allows them to escape from the army. Mass Extinction then twists her ring and produces her celestial bronze battle axe.
While hiding out in a building, they hear the army making a rattle and are surprised to see Earth Land Lucy with them. They immediately rush to help her, but are surprised that Lucy can use her own Celestial Spirit Magic, managing to summon Scorpio and Aries to fight the army. While hiding out in a forest, they learn that Lucy used Horologium to hide out against the Anima and that Mystogan is the one who sent her to Edolas. Earth Land Lucy then boasts about currently being the current strongest Fairy Tail Mage as she is the only one who has her Magic with her, and the group then formulates a plan, with Ashley realizing that they may be able to change things in Edolas. Mass Extinction realized that she never actually tried to use her magic her so she reverts her axe back to a ring and successfully uses her Terataspis Soul.
While hiding out at Sikka, Edolas Lucy decides to abandon them and head back to the guild so she can persuade the other guild members to help them. The next morning while wandering around, they spot an airship belonging to the Royal Army, and decide to hijack it so they can make it to the Royal City faster. However, when Lucy tries to summon Loke, Virgo appears instead and their plan hits a major problem. However, they are saved by none other than Natsu's counterpart. When they stop they are surprised to learn that Edolas Natsu has driven them all the way to the Royal City, as well as his split personality of a confident driver to a shy boy who is afraid of Lucy when he's out of a vehicle. When Dragion leaves and the group enters the city, they are surprised to see that Magic isn't outlawed in this town and are shocked when they see a giant Lacrima. They learn that the people at the Royal City claim it to be given to them by a god and the Mages, especially Natsu, are outraged by the King's arrogant nature and greed, with Lucy trying to calm him down. Mass Extinction finds out she has an Edolas counterpart named Jesse Jones with no magic or powers just an ordinary citizen annoyed with her king. She also finds Harry Potter and he doesn't know he got here.
Knowing that their friends are trapped inside the Lacrima crystal, the Mages try to find a way to release them and realize that the King might know a way to undo the spell. Also, Carla starts having visions about the kingdom and some secret routes that they can use, so they decide to infiltrate the palace and have Gemini take on the king's form and his memories so they can find the answer they're looking for. However, they are ambushed and captured by the army led by Edolas Erza. Just when Happy and Carla try to get them to stop, they immediately bow down, call them Exceed, and thank them for their successful mission, greatly shocking them since Carla thought their mission had something to do with the Earth Land realm