There once was a man named Akihiko Kayaba, who was the lead of VR development.
Before his mind dispersed into cyber space, he had an item called the 'World Seed' planted.
From this seed, VR games sprang up like wild fire. The crown jewel of this virtual kingdom was ALfheim Online, the world of the faeries, for it was in this game that the 100 Floor Castle, Aincrad, was located.
From all over the world people logged on to ALfheim to contribute in clearing all 100 floors, and for a chance to make fame and fortune, and become a legend in the VR world.
YO!
Ya-yo, ya-yo,
Dreamin; Don't give up Kirito,
Dreamin; Don't give it up Klein,
Dreamin; Don't give it up Leafa,
Don't gi-Give it up, Give it up,
Give it up, Give it-
NO!
Here's how the story goes, we find out,
'Bout the challenge of 100 floors, there's no doubt,
The play who clears them all they'll sing,
"I'll be king of the Vr, I'm gonna be king!"
Ya-yo, ya-yo, ya-yo,
Uh-oh,
His name's Kirito,
(Black Swordsman Kirito)
He's gonna be king of the VR!
He knows how to duel wield,
(how does that happen?)
KLING-KLANG-SLASH
He unlocked it as a sword skill,
Ya-yo, ya-yo, ya-yo,
His name is Klein, he's a Salamander Samurai,
and the Slyph of the group, Leafa's not battle shy,
Comin from GGO, Sinon's workin' her sniper thing,
Liz is blacksmithin', Asuna's doctoring,
Ya-yo, ya-yo, ya-yo,
Uh-oh,
Try to clear Aincrad, it's the 100 floor challenge,
There in ALfheim,
Ya-yo, ya-yo,
Let's go clear Aincrad!