Kirito jumps into a new VRMMORPG called ALfheim Online (ALO) in search of Asuna, who still hasn't regained consciousness.
On his quest to find the World Tree and reach Asuna, he meets a sylph girl named Leafa.
A veteran player experienced with the sword, Leafa recognizes that Kirito is motivated by serious circumstances and decides to help him.
But...Leafa's identity in the real world is Suguha Kirigaya--Kirito's sister. And it's the glimmer of her beloved brother she sees in Kirito that prompts her to lend him a hand.
Now, despite the conflicting interests guiding them on, the pair set off on a journey to the World Tree!!