Hey everyone this is an idea I'd had for Fairy Tail and the Seven Deadly Sins for some time now and I finally got around to writing it. Feel free to read this, but if you don't want to you don't have to.

"Talking"

"thinking"

Disclaimer: I do not own either Fairy Tail or the Seven Deadly Sins

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In the land of Fiore, magic is an everyday thing used for all matter of things. This ranges from lighting one house to using it to transport yourself to other locations. But those who dedicate themselves to it are called wizards. These wizards come together and form guilds that do jobs for the people that range from clears some fallen trees to dealing with dangerous wild life. But amongst all the guilds there is one guild that stands out, this guild is called Fairy Tail. And one of it's members is going on an adventure like no other.

Chapter 1:

The mission

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In the land of Fiore there is a town called Magnolia. Magnolia is the home of a guild called Fairy Tail and this guild is best known for destroying property and being unruly. But besides that, it is home to some of the best wizards of the land.

Currently it's best members are on their guilds holy land called Tenrou island. An island with a large tree in the middle of it being the most noticeable feature on it. The tree had a gnarled and mildly curved trunk, that ended at a number of large branches. These branches then came together to form what looked like an island on top of an island.

Currently the members of Fairy Tail were battered and bruised as they just finished a fight with a dark guild called Grimoire heart. After many hard-fought battles Fairy tail was able to beat the dark guild and force them off their island.

But as the guild was recovering a new threat attacked them. The dark dragon Acnologia. The dragon proved too strong for Fairy tail to defeat as all their attacks did nothing to it. As Acnologia readied it's dragon breath attack, the members of Fairy Tail joined hands as they braced themselves for the attack knowing that they couldn't get away from it in time. But as the attack came closer to them a bright light appeared before them as they all blacked out.

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Some time later in a weird world filled with stars and small planets, one of the members of Fairy Tail laid there on the ground as she started to stir. She was a girl with shoulder length blond hair tied in a pigtail on the right side of her head. On her right hand was a pink stamp of the Fairy Tail guild mark (If you don't know what it looks like you have to look it up, I don't know how to describe it). She had black boots on that went to her knees and a blue skirt on. Her skirt was held up by a belt that had whip on one side a pouch of keys on the other. She had sleeveless shirt on that was white with a blue cross in the middle of it. This was Lucy Heartfilla.

As Lucy rubbed her eyes as she started to sit up. As she started to get her bearings she was shocked at what she was seeing.

"Where am I?" Lucy asked herself out loud as she stood up as she then realized something. "Where are the others!" She cried out as she tried to look for them.

"They are not here old friend." Said a voice form behind Lucy. Getting caught off guard by it Lucy jumped as she turned to see who it was.

Standing before her was a giant with broad shoulders and an oversized mustache that reached his upper torso. He was clad in plat armor that was white and he wore dark chainmail underneath it. He also wore a helmet that has a pair of massive horns pointing upwards on each side with a plumage on top of it, consisting of three to four distinct feather-like ornaments. And to finish his look he wore a black cape. This was the Celestial spirt king.

"Mustache-man!?" Said Lucy in shock as she didn't know why the king of the celestial spirts was in front of her, while also using her nickname for him.

"It is good to see you old friend, Leo and Capricorn told me what you had just gone though." Said the king as Lucy got confused about something.

"Then, where am I? And where are the others?" She asked not sure what was going on.

"You are in the celestial spirt realm." The king told her as Lucy looked around in shock as no one had every been to this realm before as the king continued. "As for your friends they are safe. At the last second you all activated an ancient spell. This spell is called fairy sphere with it your friends are safe, until the magic wares off."

Hearing this made Lucy feel better, but there was one question in her mind. "Then why am I here?"

"I'm hiring you for a job." The king told her as Lucy couldn't believe what she just heard.

"A Job!? What do you even need me for?" Asked Lucy unsure what she could even do for him.

"Follow me. I will explain on the way." The king told her as he walked onto a planet. Lucy still unsure followed him and walked onto the planet as it then took off.

"For you to understand the job I must first explain the history of our people to you." Said the King making Lucy wonder what he meant by that.

"A long time ago the celestial spirt realm was connected to two world yours and another. This other world could use magic as well, but unlike your world this world had more then just humans living on it. This world had giants, fairies, angles and even demons living on it as well. Around three thousand years ago the demon clan declared war on the other clans. Fearing that they would come to this world and then to yours I sealed the doors to their world off, preventing either side from entering. I do not know how the war was won, but I do know that the demon clan lost the war and were sealed away."

"Then what do you need me for?" Asked Lucy wondering why he needed her.

"I had a vision that the seal will brake, and the demons will return." The King told her as Lucy wondered something.

"Then why do you need me? It sounds like you should warn the other world."

"It's because I didn't see them in their world I saw them in yours." The King told her as Lucy looked like someone took the life right out of her.

"Then…then why me?" Lucy asked softly. There were more stronger wizards out their then her, surely the king could use one of them.

"You are the only one I could summon here, because you have gold keys. There is another who has the other two gold keys, but she is too young and inexperience for such a task." The king told her as he could see the uncertainty in her eyes.

"But your task is not to defeat the demons."

Hearing this shocked Lucy as she wondered what her task was. "So, what is the job?" She asked him.

"There was another part of my vision seven knights from the other world fighting the demons. Your task is to find these knights and prevent to demons from being unsealed." The king explained to Lucy as had more questions.

"What are these knights called? Where can I find them? Why are they so important?"

"I only know their name, I'm afraid." The king told her as Lucy could only nod.

"Then what are their name?" Lucy asked him.

"The seven deadly sins." The king told her as Lucy looked at him with blank eyes.

The king saw this and could only ask one thing. "What is it?"

"They sound more like a group of villains then hero's." Lucy told him as the king did admit they kind of do sound like villains.

But before they could say anything a huge gate that was chained up appeared before them. Lucy could only look on in awe at the gate, that looked large enough for even the king to walk through.

"Through this gate in the other world. Once you set foot though it you will end up in a land called Britannia. It will be there you will find the sins." The king told Lucy who could only gulp as the task before her.

"Two more things old friend." Said the king as Lucy looked up at him. "Frist off once you get through I will reseal this gate to prevent anything from coming through. But do not worry I will leave just enough of a crack for you to summon your spirts."

Hearing this made Lucy feel better as she wasn't sure if she could do this without her spirts. "And the other thing?" She asked as she wondered what it was.

"I'm going to give you a new magic." Said the King as Lucy was shocked to hear this, wondering what the magic was. "This magic is called star dress. With it you gain the same abilities as the spirt you summon. It will take some time for you to get use to it, but I'm sure it will serve you well."

The king's eye then glowed as Lucy felt the knowledge of the magic flow into her. The king then waved his hand at the door causing the locks to fall off, as the door then opened.

Lucy took a step forward as she was still unsure about all this. But then again who wouldn't be going to another world to prevent demons from being unsealed. But if she didn't do it then the demons would come to her world and destroy it.

As Lucy was about to put her first foot though the gate, the King called out to her. "Wait I forgot to give you something."

Turning around Lucy saw the King was holding something out to her. Looking closer she saw it was a palatium key that had three small diamonds on the top in a triangle fashion with a picture of a crown in the middle.

"What is this?" Asked Lucy as she had never seen a key like this before.

"This is my key." The king told her as Lucy gasped at hearing that. She looked down at the key with awe as she's never heard of this key before.

"I am giving you this key for your mission, but there is something you must know." The king told her as Lucy looked right into his eye's. "You must only use it when all other options fail. The more I go through the gate the harder it will be to keep it sealed."

Hearing this Lucy looked down at the key and nodded as she took it. Shew then turned to the gate again as she walked though it, disappearing from the king's view.

"Good luck old friend." The King said to himself as he resealed the gate but left just enough open for the spirts to get through.

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Britannia, Royal Castle

In the land of Britannia a lone knight was walking though the royal castle as he suddenly stopped and looked to the sky as if he felt something. He continued to look as a smile formed on his face.

"So that old fool opened to gate to his realm." The knight said to himself. "That means I will succeed with my goals then." The knight then continued onwards as he wondered who the king of the Celestial spirts sent to this land in order to stop him.

Well be honest what do you think about it. In this story Lucy will join the sins and help them battle the demons. I won't be easy for he at first, but she will be able to hold her own in time.

So once again feel free to let me know what you think.