One day, Asuna hears from Lisbeth of a mysterious avatar has been causing quite a commotion among the players. According to the rumor, the avatar has been defeating players to a one-on-one duel using their original sword skill as a wager in the northern town located on the 24th floor of the new Aincrad. After Kirito is beaten by the avatar named “Zekken (Absolute Sword),” Asuna challenges Zekken and has a very close match, but is defeated at last. But, as soon as the duel is over, Zekken invites Asuna to join their guild. However, there is the secret behind the sheer power of Zekken…