There is But One Ultimate Way

There is But One Ultimate Way is a Side Story that takes place after the Alicization arc.

Plot
Kirito awakes in an bed in Underworld, moments later he realises that he's surrounded by Alice, Asuna and the other girls. After they wake up they start talking and Kirito asks for answers about what's happening. In the conversation they reveal that they all are in the STL running at 10000 times faster to enjoy their last five hours of vacation, and confess that they all love Kirito and want to marry him in the game before the whole group dissolves and each one of them take their own separate way.

Trivia

 * Kawahara Reki confirmed on his twitter that this side story is not canon.
 * Kirito takes after a different personality.