Kirito, Asuna und Yui waren auf der ersten Ebene im Gespräch mit Sasha, die über ihre Pflicht die Kinder zu betreuen und die jüngsten Ereignisse im Zusammenhang mit der Armee sprach als ein Mitglied eben dieser Gilde kam. Sie stellt sich als Yulier vor und erklärt was geschehen war und als bat Asuna und Kirito um Hilfe, der eigentliche Führer der Armee, Thinker zu retten, der in einem Hight Lavel Dungeon unter der ersten Ebene gefangen war. Sie gingen in den Dungeon und Kirito genoss es, alles zu töten, was auf seinem Weg war. Als sie zu einer sicheren Zone kamen, wo sich auch Thinker aufhielt, wurde Yulier von "The Fatal Scythe" angegriffen, als sie in seine Richtung lief. Kirito und Asuna retten starben fast bei dem Versuch sie zu schützen, doch Yui rettete sie indem sie das Monster zerstörte. Es wird bekannt, dass sie eine KI zum Schutz der Spieler war und wurde durch die Beobachtung des Schmerzes all der Spieler und dabei nichts zu tun zu könne, in den Wahnsinn getrieben. Sie war im Begriff, von Aincrad KI Controller, Cardinal, gelöscht zu werden, als Kirito sie in einen kleinen blauen Kristall sichern konnte.
Am 1. November 1. Ebene in der Hauptsiedlung, «Stadt der Anfänge»; Kirito und seine Familie hatten ihr Frühstück im Zimmer der Kirche wo Sasha und die Kinderspieler wohnen. Sie waren erstaunt, wie viele Kinderspieler in der Kirche waren. Yui schien sich von ihrem Panikattacke schon erholt zu haben. Sasha erklärte Kirito und Asuna, dass seit der Ankündigung des Death Game, sie fühlte, dass es ihre Pflicht war, sich um die Kinder zu kümmern, die im Spiel gefangen wurden. So ging sie auf ihren täglichen Spaziergängen in der Stadt auf die Suche nach Kinderspielern aber sie hatte Yui nie gesehen. IN dem Moment erhielten sie einen Besuch von Yulier, ein weiblicher Spieler der «Armee», wobei alle dachten, dass sie hier war, um sich über den früheren Vorfall zu beschweren. Stattdessen dankt Julier Kirito und Asuna dafür, dass sie ihre Mitglieder der «Armee» bestraften, die Ärger verursachten. Sie erzählt ihnen, dass sie gekommen sei, um um ihre Hilfe zu bitten.
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Yulier explained that the «The Army» became more corrupt and irresponsible thanks to the efforts of its former sub-leader: Kibaou, who was trying to overtake leadership from a player named Thinker. The guild became corrupt when Kibaou came into power and enacted upon collecting taxes from people in the Town of Beginnings, and people were led to believe that he no longer cared about clearing the death game. As an attempt to dissuade this, Kibaou sent Kobatz and his men to challenge Floor Boss of the 74th Floor by themselves, which resulted the deaths of Kobatz and two of his subordinates, thus the guild planned to exile Kibaou for this reckless action. Desperate, Kibaou lured Thinker into a high-level dungeon without any equipment or crystals, under the guise of apologizing to him for the incident. Once Yulier heard about two high-level players that had come to the 1st Floor, she went to find them. Kirito and Asuna had doubts about Yulier's story, as it could have been a trap. However, after Yui stated that she somehow knew that Yulier was telling the truth, Kirito chose to believe in her story, instead of later regretting not helping her, and thus they agreed to help. Kirito and Asuna then told Yui to stay with Sasha for safety, but Yui showed a rebellious side as she wanted to come with them, forcing them to take her along.
As they entered the dungeon, Yulier explained to the group that Kibaou wanted to have this area for The Army's personal benefit, however the monsters were too strong for him, so he couldn't use it as much. The dungeon is speculated to have been unlocked as the clearers made progress on the higher floors. During their progress in the dungeon, Kirito was enjoying himself by defeating a group of Scavenger Toads they had come across, with Asuna and Yui cheering on, but Yulier felt bad about him handling all the monsters, though they assured her that Kirito did not mind. Yulier then checked her map and discovered that Thinker remained in one spot, most likely a safe zone. After the battle, Kirito told the others that he had collected items from the monsters, revealing that those items were Scavenger Toad Meat that he was hoping Asuna would cook. Instead, she threw them all away in disgust, to Kirito's dismay and despite his protests, the scene making Yulier smile, something that Yui noticed and expressed joy about.
They finally arrived in a corridor with the safe area up ahead, where Kirito used his detecting skill to confirm that Thinker was trapped in there. Yulier began running towards him, but Thinker yelled to her to stay back. As Kirito was wondering why Thinker was telling them not to come closer, he detected an enemy named «The Fatal Scythe» hiding in the shadows. As The Fatal Scythe was about to land its scythe on her, Kirito jumped right on time and pushed her out harm's way. Kirito then asked her and Yui to run to the safe area and teleport out, which she agreed, though Yui was concerned. Although he also asked Asuna to go with them, she refused and stood by Kirito. Even though Kirito was unable to identify the boss, he presumed that it was as strong as a boss on Floor 90 or above. As the boss attacked, Kirito and Asuna blocked it, but were blown away from the hit and lost half their HP in the process.
The blow from the scythe was very hard on them, and both were unable to get back up. As the boss was about to deal the finishing blow on Kirito and Asuna, Yui left the safe area, just as Thinker and Yulier were teleporting away, and stepped in front of The Fatal Scythe. The monster then attempted to attack her, but just after she told the couple that they do not need to worry about her, The Fatal Scythe's attack was repelled by an «Immortal Object» shield, which left Kirito and Asuna in shock. Yui then levitated, changed to the clothes she originally had when Kirito and Asuna found her and generated the «Object Eraser» in the shape of a huge flaming sword which she used to remove the boss with a large flaming sphere. Yui then told Kirito and Asuna that she had recovered her memories.
Back in the safe area, Yui, finally pronouncing the names of her so-called parents correctly, explained that the Cardinal System, which regulated the entire SAO server, created an AI called the «Mental Health - Counseling Program Prototype 1», codename Yui, who was given the ability to emulate emotion to put players at ease with her. She explained that she was intended to take care of the player's mental health, but, for reasons she never understood, Cardinal prevented her from interacting with the players, effectively forcing her to monitor their emotions without a way to interfere. She only saw hate, rage and desperation in the players until she saw Asuna and Kirito, who were enjoying themselves despite being trapped in the death game, and decided to get as close to the two. Yui, crying in happiness, wondered how it was possible for a mere program to think like that until Kirito told her that she was no longer being controlled by the Cardinal System, and thus she could think whatever she wanted. After Kirito asked what Yui wanted, she replied that she wanted to stay with them forever, and the family shared a tearful hug. Although Kirito and Asuna assured Yui that she would be with them forever, Yui sadly explained that she used a GM Console, the large black cube in the safe zone, to delete The Fatal Scythe, resulting in the Cardinal System detecting her presence and, due to her disobeying its orders, the system now recognized her as a "foreign object" and proceeded to remove her from the system. Yui thanked Kirito and Asuna and requested them to help other players in her stead and to continue smiling before she turned into particles of light that vanished into thin air.
Kirito, after cursing the Cardinal System and Kayaba Akihiko, took the keyboard of GM console while Yui's credentials were still active and managed to save Yui's program by transforming it into an in-game object, «Yui's Heart», which Asuna then wore as a pendant, while Yui's data was stored into his NerveGear's local memory. On the way home, Kirito and Asuna talked about recreating Yui after they escape from SAO. Yui's particles then floated by and her voice said "Mommy, good luck."
- Teleport Crystal x 3
- Teleport Crystal - given by Yulier
- Aincrad Ebene 1:
- Aincrad Floor 22
- Adapted from Volume 2, Morning Dew Girl
- In the novel, Asuna herself accessed the shared inventory with Kirito and deleted the Scavenger's meat from the inventory without taking it out, while in the anime, Kirito takes out all of the meat from the inventory and Asuna literally throws it away.
- In the novel, when Thinker tells the group to stay away from the corridor, Asuna spots a yellow cursor and discovers that it is a boss called The Fatal Scythe. In the anime, Kirito detects the boss instead, without the cursor appearing in his screen, although the name of the boss is shown.
- In the novel, it is mentioned that Kibaou used a Corridor crystal to send Thinker into a dungeon. This is omitted in the anime.
- In the Light Novel, Kirito fought against crayfish-like monsters. The crayfish-like monsters are not seen in the anime.
- It isn't mentioned in the anime that The Army found a very large boss in the Hidden Dungeon, nor was it mentioned that they had teleport out of the dungeon in panic.
- The part about Thinker exiling Kibaou and his followers after his rescue was omitted in the anime.