Sword art online was the first game of its kind as it allowed the players to feel everything that happened inside of it, unfortunately for everyone that bought the game, the day that the game went online was the last day they ever saw the real world.
Ten years ago a madman trapped everyone inside Sword Art Online and forced everyone that was inside the game to fight for their lives, the man had somehow figured out a way to kill anyone whose avatar[Character] died in the game.
Unfortunately for everyone that was trapped inside the game, their problems had just started.
No one knows if Hueco Mundo is real, if it's hell, a result of having so many different minds connected, or just an update to the game, but somehow the flying castle of Aincrad along with all of the players found itself there.
No one inside of Aincrad had even realized it had happened and as a result, they were completely unprepared for the Hollows that immediately invaded the castle.
Fortunately for everyone inside the castle, Aincrads' defense system activated and the castle began to create all kinds of monsters to fend off the Hollows and protect the players.
In a single day, the very creatures that the players had to kill and considered enemies, had turned into their protectors.
The war lasted for more than ten years and both sides lost a lot of people.
Granted that because Aincrads self-defense system activated and as a result, it began to create all sorts of monsters to fend off the Hollows.
If anyone could describe the first couple of months or years they would have compared it to hell, as there wasn't a moment or a place where anyone could find any peace.
It was during that time that the older players began to work together and even reached out to some of the monsters to figure out the hollow's weakness.
Every time a hollow was killed or captured it would be dissected to see how it worked and how it could be used to make everyone stronger.
As time passed someone figured out a way to combine the hollows with the magic crystals that the players used to defend themselves and make their spells stronger.
With this information, the players were soon able to create better weapons and armors along with new spells that copied the attacks that the hollows used.
Little by little the alliance between the players and the monsters pushed the invaders out of Ainctrad, and for a moment, it seemed as if the war was finally going to end.
Unfortunately, fate had other plans in mind, as rummers about the war had spread through Hueco Mundo and reached the ears of someone who was truly dangerous.
Barragan Ruizenban the King of Hueco Mundo had heard about the war and decided that conquering Aincrad would help him relieve some of his boredom.
Unfortunately, he wasn't alone as several Vasto Lords had also come to invade or destroy Aincrad, along with their armies.
Had the Floor Bosses and Radius the Final Boss of Aincrad not entered the war everyone would have died.
"So we have a deal, you stay on your side and we will stay on our side." Heathcliff said as he and the leader of the hollows shook hands.
"As long as you keep your end of the deal, we get to challenge your queen for her kingdom." Barragan Ruizenban the King of Hueco Mundo said to Heathcliff before he let go of Heathcliff's hand.
"And we get to challenge you for yours." Heathcliff said to Barragan as he walked away from him.
As the two leaders walked away from each other and rejoined their armies they glanced at one another before they decided to forget about each other for now.
As the players teleported back into Aincrad they found themselves surrounded by everyone that survived the war.
Today was a special day, as not only had today been the day that the peace treaty had been sighed but Lady Radius had agreed to resurrect everyone that died both in the death game and in the war with the Hollows.
Everyone watched as Lady Radius waves her massive hands and she resurrected all of the dead players, one by one the pillars of light landed on the floor and revealed the sleeping forms of the dead players.
As the players opened their eyes, they were shocked to find that they were surrounded by people and monsters, who were either crying tears of joy or pulling them into tight hugs, as they welcomed them back to the world of the living.
While the payers celebrated Barragan smirked as he knew that despite everything that had happened these last ten years they were nothing compared to what was to come.