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Three friends decide to venture to the fabled cave in the End Mountains. Both Kirito and Alice alleviate Eugeo's fear that they might be violating the Taboo Index, the laws of their world, and soon enough, it's time for them to set off.

Kirito, along with his childhood friend, Eugeo, has been tasked with cutting down a colossal tree called the Gigas Cedar. They’re swinging their ax when their friend Alice arrives with lunch. As they eat, the three friends decide to go to a fabled cave.

Kirito wakes up to find himself inside a fantasy game that resembles a mysterious world. His memory is fuzzy and he attempts to log out, but is unable to return to the real world.

Kirito wakes up to find himself inside a mysterious world evoking a fantasy game. His memory fuzzy, he tries to log out, but is unable to return to the real world. After wandering aimlessly, he finds himself underneath a colossal tree.

Kirito makes up his mind to journey to the center of the Human Empire in the Underworld. Since he'll need Eugeo's help to get there, Kirito is determined to help Eugeo knock down the Gigas Cedar so that he can be free from his Calling.

Kirito makes up his mind to journey to Centoria. Since he’ll need Eugeo’s help, he also decides to fell the Gigas Cedar. Meanwhile, Alice’s little sister, Selka is worried about Eugeo, and opens up to Kirito about her concerns.

Kirito and Eugeo realize Selka has gone to the End Mountains alone, and decide to chase after her. As they enter the cave, they encounter goblins - presumably from the Dark Territory - and must engage in a battle.

Kirito and Eugeo realize Selka has taken off to the End Mountains alone, and decide to chase after her. As they enter the cave, they encounter goblins, presumably from the Dark Territory, and must engage in a battle.

Suspicious, Asuna and Suguha speculate that Kazuto may be at Rath, his part-time workplace where they research the Soul Translator. Asuna and the group decide to split up to find out more about Rath.

In the real world, Kazuto Kirigaya lies unconscious. At Kikuoka’s request, Kazuto is moved to a well-equipped hospital, but when Asuna and Suguha try to visit, they’re turned away. Suspicious, Asuna and the others split up to find out more about Rath.

Asuna infiltrates Rath, the research lab in the Ocean Turtle, where she relentlessly grills Kikuoka about Kazuto's whereabouts. Kikuoka reveals that behind the development of the Soul Translator is a mind-blowing objective of epic scale.

Asuna infiltrates Rath, the research lab in the Ocean Turtle, where she relentlessly grills Kikuoka about Kazuto’s whereabouts. Kikuoka reveals that behind the development of the Soul Translator is a mind-blowing objective of epic scale.

Two years have gone by since Kirito and Eugeo left Rulid Village. In the capital city, Centoria, both boys have attained their goal of being admitted to the North Centoria Imperial Swordcraft Academy.

Two years have gone by since Kirito and Eugeo left Rulid Village. In the capital city, Centoria, both boys have attained their goal of being admitted to the North Centoria Imperial Swordcraft Academy.

Kirito finds himself in a duel against the Elite Disciple Volo Levantein, using real swords. As the curious crowd looks on, Kirito is encouraged by Sortiliena, and the duel begins.

Kirito finds himself in a duel against the Elite Disciple Volo Levantein, using real swords. As the curious crowd looks on, Kirito is encouraged by Sortiliena, and the duel begins.

Now an elite disciple along with Kirito, Eugeo struggles daily with the question of what he should infuse his sword with to become stronger. Eugeo decides to accept Humbert's request for a duel in order to gauge the extent of their power.

Now an Elite Disciple along with Kirito, Eugeo struggles with the question of what he should infuse in his sword so he can become stronger. When he’s taunted by Raios and Humbert, Eugeo decides to accept Humbert’s request for a duel.

Ronie and Tiese are late getting to the dorm. Kirito rushes out in search of them, but no sooner has he gone than Frenica appears. She tells Eugeo about how she’s suffered at Humbert’s hands, and that Tiese and Ronie went to confront him about it.

Ronie and Tiese are late getting to the dorm. Kirito rushes out in search of them, but no sooner has he gone than Frenica appears. She tells Eugeo about how she’s suffered at Humbert’s hands, and that Tiese and Ronie went to confront him about it.

Kirito and Eugeo are now considered criminals for having violated the Taboo Index. Meanwhile, on the Ocean Turtle in the real world, Asuna is watching over Kazuto as he's being treated, when a curious-looking robot appears before her.

Kirito and Eugeo are now considered criminals for having violated the Taboo Index and are thrown into the underground prison in the Central Cathedral. Meanwhile, on the Ocean Turtle in the real world, Asuna is watching over Kazuto as he’s being treated.

Kirito and Eugeo succeed in escaping from their underground prison cell, only to find their way blocked by Eldrie Synthesis Thirty-one, under orders by Alice to lie in wait for them. The three are soon in battle mode.

Kirito and Eugeo escape from their cell, only to find their way blocked by Eldrie Synthesis Thirty-One, under orders from Alice to lie in wait for them. Kirito and Eugeo struggle against him until Eugeo realizes that he’s seen Eldrie somewhere before.

Cardinal explains to Kirito how the Axiom Church and the Taboo Index came to be. Kirito can barely hide his incredulity, but Cardinal has yet another revelation: the grave danger now threatening the Underworld.

Kirito and Eugeo have been rescued by the young girl, Cardinal, who has secluded herself inside the Central Cathedral’s Great Library. Cardinal explains to Kirito how the Axiom Church and the Taboo Index came to be, starting with Administrator’s past.

Kirito and Eugeo head to the top floor of the Central Cathedral. On the way, they find their confiscated swords, only to be greeted with a hail of arrows by the Integrity Knight, Deusolbert Synthesis Seven.

After being entrusted with the fate of the world by Cardinal, Kirito and Eugeo head to the top floor of the Central Cathedral. They find their confiscated swords, only to be attacked by the bow-wielding Integrity Knight Deusolbert Synthesis Seven.

Kirito and Eugeo are on their way up the stairs of the Central Cathedral when they encounter two girls named Linel and Fizel. As they stand wondering what two children are doing there, Linel and Fizel paralyze them with poisoned swords.

Kirito and Eugeo are on their way up the stairs of the Central Cathedral when they encounter two girls named Linel and Fizel. As they stand, wondering what two children are doing there, they let their guard down and...

Though riddled with wounds, Kirito manages to activate his Perfect Weapon Control art. Continuing on their way to the top floor of the Central Cathedral, Kirito and Eugeo find themselves standing before a strange-looking floating platform.

Though riddled with wounds, Kirito manages to activate his Perfect Weapon Control art. Continuing on their way to the top floor of the Central Cathedral, Kirito and Eugeo find themselves standing before a strange-looking floating platform.

When Kirito and Alice both unleash the Perfect Weapon Control art in the Cloudtop Garden, the impact rips a hole into the seemingly impregnable Central Cathedral wall, which sends them both flying outside.

When Kirito and Alice both unleash the Perfect Weapon Control art in the Cloudtop Garden, the impact rips a hole into the seemingly impregnable Central Cathedral wall, which sends them both flying outside.

Eugeo reaches the 90th floor of the Central Cathedral, which turns out to be a vast communal bathing area. Eugeo then encounters Bercouli Synthesis One as the Integrity Knight soaks in the bath to ease his fatigue after a long journey.

Eugeo reaches the ninetieth floor of the Central Cathedral, which turns out to be a vast bathing area. The perplexed Eugeo encounters Bercouli Synthesis One soaking in the bath. Meanwhile, Kirito and Alice are still climbing the Central Cathedral wall.

Seeing Alice's reaction when he happens to mention the name "Selka," Kirito decides to tell her the truth about the Integrity Knights. But unable to accept that truth, Alice becomes visibly distraught.

Seeing Alice’s reaction when he mentioned the name Selka, Kirito decides to tell her the truth about the Integrity Knights. Meanwhile, after being knocked unconscious during his battle with Bercouli, Eugeo awakes on the top floor of the cathedral.

Along with Alice, Kirito reaches the communal bathing area on the 90th floor. There, they find the Integrity Knight Commander, Bercouli, who's been turned into stone by Chudelkin.

Kirito and Alice reach the communal bath on the nintieth floor. There, they find the Integrity Knight Commander, Bercouli, who’s been turned to stone by Chudelkin. Alice breaks down in tears upon seeing her mentor’s tragic plight, but then...

Standing in Kirito and Alice's way is Eugeo, who's undergone the Synthesis Ritual and become an Integrity Knight. Kirito is rattled, until Alice admonishes him into resolving to fight Eugeo with everything he's got.

Standing in Kirito and Alice’s way is Eugeo, who’s undergone the Synthesis Ritual and become an Integrity Knight. Kirito is rattled, until Alice admonishes him into resolving to fight Eugeo with everything he’s got.

On the top floor of the Central Cathedral, Kirito, Eugeo, and Alice finally face Administrator. But Chudelkin uses the sacred arts to transform himself into a giant clown and attacks.

On the top floor of the Central Cathedral, Kirito, Eugeo, and Alice finally face Administrator. But Chudelkin uses the sacred arts to transform himself into a giant clown and attacks.

Cardinal appears on the top floor of the Central Cathedral for a showdown with her bitter foe. She makes a move to attain her objective as a program for maintaining order only to see the fallen Sword Golem rise up again to thwart her.

Cardinal appears on the top floor of Central Cathedral for a showdown with her bitter foe of the last two hundred years. She moves to achieve her objective of deleting Administrator, only to see the fallen sword golem rise up again.

Carrying the hopes of Cardinal, Eugeo, and Alice in his heart, Kirito stands yet again and visualizes the Black Swordsman, the top player who cleared SAO. For the sake of everyone he’s encountered in this world, Kirito, faces off with Administrator.

Carrying the hopes of Cardinal, Eugeo, and Alice in his heart, Kirito stands yet again and visualizes the Black Swordsman, the top player who cleared SAO. For the sake of everyone he’s encountered in this world, Kirito, faces off with Administrator.