An der Krone des Weltenbaums angekommen, gelangt er endlich zu Asuna. Doch dann taucht plötzlich Oberon auf, fesselt Asuna und verletzt Kirito. Doch mit Akihikos Hilfe kann Kirito Oberon zum letzten Duell herausfordern.
Arriving at the top of the World Tree, Kirito and Yui finally manage to reunite with Asuna. However, they are suddenly hit by high gravity magic, which forces Yui to retreat, and are confronted by Sugou. As Sugou reveals his plans to control the human soul, he chains Asuna up and starts to molest her in front of Kirito, who is stabbed and forced to endure incredible pain. As Kirito falls into despair, he hears the voice of Akihiko, who encourages him to stand up and fight, realising the pain is nothing compared to the pain of SAO. Using Akihiko's administrative abilities, Kirito manages to strip Sugou of his high level and challenges him to a fight with no pain absorption, showing him what true pain is before finishing him off. After logging Asuna out, returning her to the real world, Kirito meets with the remnant of Akahiko's memory, who gives him an item called The Seed before leaving. After returning to the real world and giving his thanks to Suguha, Kazuto makes his way to the hospital to finally meet Asuna for real.
Avec l'assistance des Sylphes et des Cat Siths, Kirito parvient a accomplir la Grande Quête. Accompagné de Yui, ils atteignent le sommet de l'Arbre du Monde, objectif de tout joueur de ALO, et sont à nouveau réuni avec Asuna. Kirito essaye immédiatement de ramener Asuna dans le monde réel, mais Yui lui apprend qu'elle est reliée à un code complexe, et qu'il aura besoin d'une console système avec les permissions appropriées pour la déconnecter. Mais il est deja trop tard, Sugô, alias Oberon, a déjà lancé un assaut contre eux
Kirito e Yui riescono infine a raggiungere la prigione di Asuna ma proprio quando sono sul punto di fare ritorno al mondo reale vengono scoperti da Sugou alias Re Oberon. Kirito per salvare Asuna dovrà quindi affrontare colui che in quel mondo ha un potere pari a quello di un Dio.
シルフとケットシーたちの協力のもと、キリトはグランド・クエストを突破した。キリトとユイは《ALO》全プレイヤーがめざす《世界樹》の頂上に到達し、ついにアスナと再会を果たす。キリトはすぐにでもアスナを現実世界に戻そうとするものの、ユイによると複雑なコードに拘束されたアスナをログアウトさせるには権限を有するシステム・コンソールが必要らしい。だが時すでに遅く、須郷こと、オベイロンの魔の手がキリトたちに襲いかかる。
키리토는 천신만고 끝에 세계수 위에 다다랐지만 공중도시는 온데간데 없었다. 그리고 드디어 아스나와 감격의 재회를 하는 순간, 갑자기 시야가 깜깜해지고...아스나를 가둬둔 원흉 스고우, 즉 요정왕 오베론이 나타난다.
Kirito e Yui finalmente têm a grande chance de ver Asuna novamente, mas o Rei Fada aparece em grande estilo, pouco disposto a deixar as coisas fáceis.
Kirito, Asuna y Yui al fin están juntos de nuevo, pero los candados puestos en Asuna son irrompibles. Antes de tener oportunidad de pensar en un plan, aparece el Rey de las Hadas.
在風精靈與貓精靈的相助下，桐人終於成功完成了終極任務。桐人與結衣來到所有ALO玩家的目標──世界樹的上方，終於見到明日奈。當桐人想馬上想讓明日奈登出遊戲，但從由依口中知道若要解除把明日奈拘束著的複雜密碼，就一定要先找到擁有特定權限的系統控制台。這時候，須鄉以世界支配者精靈王奧伯龍的姿態出現，更以壓倒性的力量把桐人打倒……
Kirito e Yui finalmente têm a grande chance de ver Asuna novamente, mas o Rei Fada aparece em grande estilo, pouco disposto a deixar as coisas fáceis.
