Episode Title:
The End of the World.
Episode Description:
After the Skull Reaper is finally defeated, Kirito deduces that Heathcliff is secretly Akihiko Kayaba's avatar, exposing him as indestructible and revealing him as the boss of the 100th Floor. Heathcliff paralyzes everyone except Kirito and challenges him to a duel evenly matched, promising that the remaining players will be logged out of the game if Kirito wins, to which Kirito accepts the challenge and fights Heathcliff...
