Sword Art Online

• 1. Introduction

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  Sword Art Online opens with 10,000 players logging into a virtual reality game for the first time on the 6th of November, only to discover that they cannot log out. The year is 2022, and each player wears a helmet called the NerveGear, which stimulates the five senses through the brain. Players steer their in-game characters with their minds alone. Then the game's creator appears with an announcement that turns a launch day into something far darker.

  That scene begins a Japanese light novel series by Reki Kawahara, and it raises questions that run through everything that follows. What does a person become when a game is the only place left to live? Why would an author set aside the manuscript that started it all? How did one story grow into novels, comics, films, songs and video games across many countries? And why do reviewers praise and criticize it in the same breath?

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• 2. Aincrad

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  Akihiko Kayaba designed both the game and the NerveGear, and he was the one who delivered the terms. He told the trapped players that they must clear all 100 floors of Aincrad, a steel castle that serves as the game's setting. Anyone who dies in the game, or who has the helmet forcibly removed outside it, will die in real life as well.

  Kazuto Kirigaya, who plays as Kirito, had an edge over almost everyone. He was one of 1,000 testers in the game's earlier closed beta, and he already had virtual reality experience. He also felt driven to protect other beta testers from discrimination. So he kept away from the larger groups and played alone, wearing the nickname "beater", a blend of "beta tester" and "cheater".

  Asuna Yuuki entered his story as a young woman he befriended while the players climbed the floors. The two formed a relationship and eventually married inside the game. Asuna joined a guild whose leader went by the name Heathcliff. That name turned out to be the secret identity of Kayaba himself.

  Kirito and Asuna uncovered the truth, confronted Kayaba and destroyed him. Doing so freed them and the other players from the game. Freedom was incomplete, however. Back in the real world, Kazuto learned that 300 players, Asuna among them, remained trapped inside their NerveGear. He rushed to the hospital to see her, and there he met her father, Shouzou Yuuki.

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• 3. Fairies and Guns

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  Nobuyuki Sugou, an associate of Shouzou Yuuki, asked Shouzou to make a decision. Sugou later revealed that the decision was his own marriage to Asuna, which angered Kazuto. Several months afterward, a fellow survivor named Agil told Kazuto that someone resembling Asuna had been spotted on "The World Tree" in another virtual world, a game called Alfheim Online, or ALO.

  In ALO, Kirito was helped by his cousin and adoptive sister Suguha, who plays as Leafa. He was also helped by Yui, a navigation pixie who began life as an AI inside the first game. Together they learned that the trapped players in ALO were part of a plan by Sugou. He wanted to run illegal experiments on their minds, hoping to perfect mind control for financial gain. He also intended to subjugate Asuna and marry her in the real world, which would give him control of her family's corporation.

  Kirito stopped the experiment and rescued the remaining 300 players. Before he left ALO to go to Asuna, Kayaba reached him one last time. Kayaba had uploaded his mind to the Internet using an experimental, destructively high-powered version of the NerveGear, and it cost him his life. He entrusted Kirito with The Seed, a program package designed to create virtual worlds. Kirito had it released online, and Aincrad came back to life as other virtual reality games began to thrive.

  The Seed, also called the World Seed, rests on a game engine called the Cardinal system. Kayaba first built that engine for the death game, and it was later duplicated for ALO. Kirito leaked the consolidated package on purpose, hoping to revive the virtual reality industry, and it worked.

  One year after the death game, a government official asked Kazuto to look into strange occurrences in virtual reality. The case involved a string of murders tied to Gun Gale Online, or GGO. Unlike the earlier worlds, GGO is styled as a first-person shooter rather than a role-playing game. An American company built it using the World Seed. Players entered through the AmuSphere, the successor to the NerveGear, and the killings were linked to a player called Death Gun.

  Shino Asada, who plays as Sinon, helped Kazuto enter a gunfight tournament called the Bullet of Bullets. There he found the truth behind the murders, which traced back to a player who had belonged to a player-killing guild in the original death game. Kirito and Sinon got two suspects captured. A third, Johnny Black, escaped, and his freedom shapes everything that happens in the next world.

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• 4. The Underworld

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  RATH, a research and development organization under the Ministry of Defense, recruited Kazuto to test an experimental machine called the Soul Translator, or STL. Its interface was far more realistic and complex than the one he had used before. RATH was using it to develop an artificial intelligence named A.L.I.C.E. Kazuto tested the machine by entering the Underworld, a virtual world built on The Seed.

  Time in the Underworld runs a thousand times faster than in the real world, and Kirito's memories of what happens there are restricted. The world is as realistic as the real one, because powerful government resources keep it running. Then Johnny Black ambushed Kazuto in reality and mortally wounded him with suxamethonium chloride. RATH placed him back in the STL to preserve his mind while they tried to save him.

  Inside the Underworld, Kirito befriended Eugeo, a carver in the small village of Rulid. Eugeo's friend Alice Zuberg had been taken by the Integrity Knights, a group of highly skilled warriors. Her offense was accidentally breaking a rule of the Axiom Church, which leads the Human Empire. Kirito and Eugeo set out to save her and began uncovering the Church's secrets. A woman known only as "The Administrator" leads it. Meanwhile, a war against the opposing Dark Territory was brewing.

  They found Alice as an Integrity Knight who no longer remembered them. Kirito helped her recall her true identity, a form of true artificial intelligence known as A.L.I.C.E. In the battle against the Administrator, Kirito slew her. Eugeo died in the fight, and Kirito was left in dismay.

  In the real world, American forces raided RATH's facility in the Ocean Turtle, hoping to take A.L.I.C.E. for reasons unknown. Two of the attackers, Gabriel "Vecta" Miller and Vassago "Prince of Hell" Cassals, took control of two Dark Territory characters and united that land's inhabitants behind them. With help from all his friends, Kirito stopped the attackers and the foreign players Vassago had lured in. A.L.I.C.E. was safely extracted and gained a physical body. Gabriel and Vassago were killed, both virtually and physically.

  Kirito did not log out in time before the flow of time returned to normal. He spent 200 years in the Underworld, about two weeks in the real world, with Asuna, who had stayed behind for him. After they woke, Kirito asked to have those memories removed, and they were. RATH employee Takeru Higa secretly kept a backup of his own 200-year-old self, who has unknown plans for the Underworld.

  One month later, the accounts of Kirito, Asuna and their friends were forcibly migrated to Unital Ring, a new game that borrows locations from every environment they had visited before.

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• 5. Web Novel to Shelf

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  In 2001, Kawahara wrote the first volume of this story as an entry for a 2002 competition connected to ASCII Media Works. It exceeded the page limit, so he held it back. He posted it instead as a web novel on his own website under the pseudonym Fumio Kunori, and it stayed online from 2002 to 2008. Over the years he added three more main arcs and several short stories. The first arc, Aincrad, and these additions were all later adapted into the light novels.

  In 2008 he entered the competition again, this time with a different work called Accel World, and won its Grand Prize. ASCII Media Works also asked him to publish his earlier Sword Art Online. He agreed and withdrew the web novel versions.

  Asked whether Kirito was modeled on himself, Kawahara said he usually does not put himself into his characters. He added a joke: "but if I had to say there was a point of similarity between Kirito and myself, it is the fact that neither of us are good at forming parties. We both tend to play solo in these games a lot." He said the female characters were not based on anyone he knew. He does not plan characters or settings before he starts writing, and they take shape as the story goes. He wrote the series to present online gaming as neither a social ill nor an escape from real life. He also said Asuna might have been created a little too perfectly.

  The illustrator abec joined once the request to publish was approved. The first volume appeared in print on the 10th of April 2009, and 29 volumes had been published by the 10th of April 2026. Volumes 1 through 8 told the arcs set in the death game, Alfheim Online and Gun Gale Online. Volumes 9 through 18 covered Alicization, and volumes 19 and 20 told a side story called Moon Cradle. The Unital Ring arc began with volume 21, released in Japan on the 7th of December 2018, and it is the first arc not based on the original web novel.

  Kawahara also writes Sword Art Online: Progressive, which follows Kirito on the first few floors of Aincrad. Its first volume came out on the 10th of October 2012, and nine volumes had been released by the 7th of March 2025. A separate novel series, Sword Art Online Alternative Gun Gale Online, was written by Keiichi Sigsawa and illustrated by Kouhaku Kuroboshi. Its first volume was published on the 10th of December 2014. A 100-page prequel novel by Kawahara, titled Hopeful Chant, was given to people who watched the Ordinal Scale film in Japan between the 4th and the 10th of March 2017.

  At a Japan Expo USA panel, Yen Press announced it had the rights to publish the light novels in English. The first volume reached readers on the 22nd of April 2014. The novels are also published in China, Taiwan, South Korea, Thailand and Vietnam.

  The story spread into comics as well. Tamako Nakamura illustrated an Aincrad manga that ran in Dengeki Bunko Magazine from the September 2010 issue to the May 2012 issue. Jūsei Minami drew a comedy four-panel version. Neko Nekobyō illustrated Girls Ops, which stars Lisbeth, Silica and Leafa. When Dengeki Bunko Magazine was discontinued in April 2020, that manga moved to the DenPlay Comic website.

  Kawahara has also written dōjinshi, or fan works, under the name Fumio Kunori. An 80-page collection of some Material Edition volumes came out on the 13th of February 2011. Reports say these works gain traction because the original author is involved and because they add detail about characters.

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• 6. Screen and Sound

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  The anime adaptation was announced at Dengeki Bunko Autumn Festival 2011, alongside Kawahara's other series, Accel World. A-1 Pictures animated it, Tomohiko Ito directed it, and Yuki Kajiura composed the music. It aired in Japan between the 7th of July and the 22nd of December 2012, adapting the first four novels and parts of volume 8. Crunchyroll and Hulu streamed it, and Netflix has carried it in North America since the 15th of March 2014.

  Aniplex of America licensed the series, and its English dub premiered on Adult Swim's Toonami on the 27th of July 2013. Manga Entertainment released it in the United Kingdom in December 2013. Madman Entertainment released it in Australia, where the English version began airing on ABC Me on the 7th of June 2014.

  A two-hour recap special with some new footage, Sword Art Online Extra Edition, aired on the 31st of December 2013. It streamed worldwide a few hours after its Japanese broadcast, with subtitles in languages including English, Spanish, Portuguese, Italian and German. The special confirmed a second season, Sword Art Online II, which premiered on the 5th of July 2014. Screening events were held in the United States, France, Germany, Hong Kong, Taiwan, Korea and Japan between the 29th of June and the 4th of July.

  The third season, Alicization, aired from the 6th of October 2018 to the 30th of March 2019, after a one-hour world premiere in seven countries on the 15th of September 2018. It was originally announced as four cours, but it stopped after episode 24. A second part, War of Underworld, continued on the 12th of October 2019. Its second half was scheduled for April 2020, but the COVID-19 pandemic pushed it back to run from the 11th of July to the 19th of September 2020.

  Theatrical films followed. Ordinal Scale, with an original story by Kawahara set after the second season, premiered in Japan and Southeast Asia on the 18th of February 2017. It reached the United States on the 9th of March. Sword Art Online Progressive: Aria of a Starless Night premiered on the 30th of October 2021, directed by Ayako Kōno, with Inori Minase joining the cast as a new character named Mito. Its sequel, Scherzo of Deep Night, was set for the 10th of September 2022 and delayed by pandemic production issues. It premiered on the 22nd of October 2022. A new film project with stories not based on the novels was announced at the tenth anniversary event, "Sword Art Online: Full Dive", held on the 6th of November 2022.

  Music carried much of the series' identity. "Crossing Field" by LiSA opened the first 14 episodes, and "Innocence" by Eir Aoi opened the rest. Eir Aoi also sang "Ignite" for the second season, and LiSA performed "Adamas" for the third. LiSA's "Catch the Moment" served as the theme for Ordinal Scale. Character songs from the home video releases were collected in Sword Art Online Song Collection, released on the 27th of August 2014, and a second collection followed on the 22nd of March 2017.

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• 7. Games and Live Action

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  Sword Art Online: End World, a social network game for Japanese feature phones and smartphones, launched on the 28th of February 2013 with more than 1 million registered users. It was discontinued in September 2017. A PlayStation Portable game from Namco Bandai Games, Infinity Moment, arrived on the 14th of March 2013. It imagines a glitch that keeps Kirito and the others in the game even after Heathcliff is defeated, and it pulls Leafa and Sinon in as well.

  Mobile games came and went. Sword Art Online: Code Register launched on the 28th of November 2014 and passed 3,000,000 downloads. Memory Defrag RPG was discontinued on the 30th of August 2021, though anyone who downloaded it beforehand can still play its offline version. A virtual reality online game, The Beginning, was in development by Kadokawa and IBM Japan but stayed a demo and will not be released as a full game.

  Later console entries tracked the story arcs. Fatal Bullet, based on Gun Gale Online, was released on the 23rd of February 2018. Alicization Lycoris was delayed by the pandemic to the 10th of July 2020. It is the first game in the franchise to follow the canon story faithfully at the start, adapting volumes 9 through 14 before moving to a new arc about Medina Orthinanos. Last Recollection was released worldwide on the 6th of October 2023 with a theme song, "VITA", sung by Reona. Fractured Daydream followed on the 4th of October 2024. Echoes of Aincrad was announced in March 2026 for PlayStation 5, Xbox Series X/S and Windows, scheduled for the 10th of July 2026.

  A live-action version has long been in the works. On the 2nd of August 2016, Skydance Television announced it had acquired the global rights to a live-action television adaptation. Laeta Kalogridis was attached to write the pilot script and serve as an executive producer. Skydance said it intended to "fast-track" the launch and to follow the series with a virtual reality experience. In February 2018, it was reported that the series had been sold to Netflix.

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• 8. Praise, Bans and Echoes

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  Oricon ranked Sword Art Online the top selling light novel series of 2012, with eight volumes among the year's best sellers. It placed first in the Kono Light Novel ga Sugoi! rankings for both 2012 and 2013, and ranked in the top five in 2011 and again from 2014 through 2018. In the first half of 2016 it was the second best selling light novel series in Japan, at 489,374 copies, while Progressive sold 321,535 copies in the same period. By 2017 an estimated 20 million copies were in print worldwide. That figure reached 26 million by 2021, and sales passed 30 million in 2022.

  Richard Eisenbeis of Kotaku called the anime the smartest series in recent years. He praised its insight into virtual reality's effect on the human mind, and he said the romance between Kirito and Asuna brings "definition to exactly what love is like in a virtual world." At that point he had watched only the first 12 episodes. After seeing the second half, he praised its plot twists and a well-written, believable villain, but felt the focus on psychological repercussions had faded. He also objected that Asuna, a strong female lead, was "reduced to nothing but the quest item the male lead is hunting for." His verdict on the two halves: "Both, however, are enjoyable for what they are."

  At Anime News Network, Rebecca Silverman criticized the anime for pacing problems, logical gaps and "sloppy writing". Theron Martin argued that it struggled "to achieve and maintain the level of gravitas that life-or-death danger should have". He also called it unwilling to commit to Kirito's "lone wolf" image. Yet Martin praised many Alicization volumes, saying the author's writing had improved. He described the first episode of its anime adaptation as "about the best adaptation that could be hoped for of the relevant source material".

  Ernest Cline, who wrote the 2011 novel Ready Player One, said in an interview that he met Kawahara at an event in Japan. They discussed how each of them had independently developed similar ideas about virtual reality. The Gun Gale Online arc, released in print in 2010, also depicts an early fictional battle royale game, the Bullet of Bullets. Kirito even made a cameo in the eighth episode of the anime Eromanga Sensei, voiced again by Yoshitsugu Matsuoka.

  The series has also met official resistance. On the 12th of June 2015, the Chinese Ministry of Culture listed Sword Art Online II among 38 anime and manga titles banned in China. In July 2020, Sword Art Online was one of seven manga titles removed from Books Kinokuniya in Australia, following serious claims about its material. Yet in the 2020 Kono Light Novel ga Sugoi! poll, voters and a jury of critics and industry figures named it the best light novel series of the 2010s, with 1,728.95 points. Kawahara has said he plans to write "one more big arc" that will return the story to the real world.

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