With the help of the Sylphs and Cat Sídhes, Kirito gets through the Grand Quest.
Kirito and Yui reach the top of the World Tree, the goal of every ALO player, and are reunited with Asuna at last.
Although Kirito tries to bring Asuna back to the real world immediately, Yui tells him that, because Asuna is bound by complex code, in order to log her out he will need a system console with the appropriate privileges.
But it is already too late - Sugou, alias Oberon, has launched an assault against them.