There is But One Ultimate Way

There is But One Ultimate Way (たったひとつの究極的なやりかた) is a Side Story that takes place after the Alicization Arc. It was written May 2010, and was included as the 7th side story in "Sword Art Online Material Edition: The Assemblage" released by the year 2011 under the title "Sword Art Online Gaiden X2: There is But One Ultimate Way".

Plot
Kirito awakes in a bed in Underworld and soon realizes that he's surrounded by Alice, Asuna, Leafa, Silica, Lisbeth, Sinon and Yui. After they wake up, they start talking and Kirito asks for answers about what's happening. In the conversation they reveal their uncertainty about the future, as Asuna and Lisbeth are about to graduate, and chances for meetings may become rare.

As such, they want to spend the last of their holidays together. All the girls confessed their love for Kirito, and made an agreement to get married to Kirito in Underworld, unbound by real-world constraints.

Trivia
 * Kawahara Reki confirmed on his Twitter that this side story is not canon.
 * The name Gaiden X2 is probably related to the fact that when a story called 16.5 once appeared on the inner-part of wordgear, the name for the text file was said to be wg_SAO_X1.htm according to some indirect source.

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There is but one ultimate way