Heres my story:

2 years after the destruction of Sin.

Yuna is just living on the Celsius. Her and her companions hunt spheres due to the lack of adventure.

Until one day while looking for a sphere, Yuna finds a weird object. She brings it back to Shinra for analysis.

Shinra finds out that  the object is from another world. Then a voice is projected from the object.

It is a cry for help. It says that a man by the name of Yu Yevon has taken over their world.

Since this name has spiked the groups interest they decide to go to this world.

Unfortunately, they do not know what is in space and if they could survive, so they send an exact model of the Celsius to space.

They now know they could go into space, but they do not know what is in space. Nevertheless they set sail for a new world...

There are new types of fiends in space, scared to leave the safety of the ship the Gullwings fight the fiends inside the ship.

The inside of the ship is heavely destroyed. It can barely move. Fortunatly they see a planet, if its the right planet or not they decided to land.

When landing in the world they lose control and land in the middle of a city.

In what seemed like seconds hordes of soldiers surronded the Celsius. Too weak to fight the group gives up.

Then, from out of nowhere a small group of people saved the Gullwings. They had no choice but to leave the ship.

The gullwings find out that the group is a underground resisitance fighting Yu Yevon. Since the Gullwings are stuck on the planet they dicided to help.

Ironically the world look a lot like Zanarkand. The Gullwings decide to adventure the world looking for more people to join the resisitance. People from the underground resisitance group decide to join.

Throughout the adventure, the Gullwings find out that there are a series of fayths here as well. At a certain point a guy named Tidus (he looks just like the other one) joins the party.

After a getting some the aid, the underground resisitance group decides to attack Yu Yevon's base, the castle in the sky.

Right before the group enters the throne room Tidus attacks the team. Heartbroken Yuna slays her lover.

Tidus confess that he was only an illusion sent by Yu Yevon. Angered, Yuna enters the throne room ready to defeat Yu Yevon.

One thing the group notices is that Yu Yevon's lest arm is completley metal.

After the group defeats Yu Yevon he tells the group what he did.

The Yu Yevon in Spira, Sin, and Tidus were created by him with the help of the Fayths. After Yuna destroyed Sin all the magic Yu Yevon used to create Sin was lost and in result he lost his left arm.

With the last of his breath Yu Yevon mocks Yuna for never being able to find true love. He dies and all of his magic gets scattered across the land so the world can prosper and once again the fayths can watch over the world.

The Gullwings head back to spira and Yuna has hope that one day she may find true love