After thwarting the would-be ambush, Kirito and Leafa set out for Aarun, towards the world tree, only to be sidetracked by an event and end up in the Underworld, «Jötunheimr». With some help from an unlikely ally, they reach the city only to find that the way to the world tree is locked. In the end, Kirito saves Asuna, they along with other SAO players are in high school, and start playing ALO but with the new feature, a new Aincrad and Kirito vows to complete all 100 floors.