The Sword Art Online Season 4 release date may seem far away considering that the third season just started airing. But announcements concerning the Sword Art Online: Alicization anime episodes and the upcoming Sword Art Online: Unital Ring light novels gives fans a glimpse into the future of Kirito, Asuna, Alice Schuberg, and other SAO characters.
What we do know for certain is that Aniplex intends on adapting the entire SAO series into anime. The production companies have confirmed that the third season will adapt the entire Alicization arc. A direct sequel to Alicization is already being worked on and while it probably won’t be longer than Alicization, it may be the final ending of the entire story.
The story for the SAO anime is written by Japanese author Reki Kawahara (spin-offs like Gun Gale Online and SAO: Clover’s Regret have a different author). SAO started life as a novel contest entry for Dengeki Novel Prize that ended up being self-published online as a web novel because the story was too long. (Unfortunately, the web novel is no longer available online.)
From 2002 through 2008, Kawahara published on his own website a series of side stories and a direct sequel that built on the success of the original premise. The series was eventually picked up Kadokawa’s Dengeki Bunko imprint and adapted into a light novel series starting in 2009.
Kawahara had many ideas besides SAO. From 2004 through 2009, he wrote a web novel called The Isolator (Zettai Naur Kodokusha), which told the story of a teenager named Utsugi Minoru, who was given a superhuman power when various extraterrestrial life forms come into contact with the human species. He also entered the Dengeki Novel Prize contest again with the Accel World story and won.
Kawahara relied on many time gaps in the original SAO story because the writing contest required that he had a solid ending, not a cliffhanger or a “to be continued” ending. Not satisfied with the way that the Aincrad story arc turned out, he rebooted the first two volumes as a spin-off called Sword Art Online: Progressive (which also has a manga adaptation). Progressive follows Kirito and Asuna as they cleared Aincrad one floor at a time.
The English translation of the SAO light novel series is being published by Yen Press. At the time the third season of the SAO anime began airing, the English light novels were only up to Volume 14. SAO Volume 15 is scheduled to release on December 11, 2018. However, there are several active fan translation projects that are already up to Volume 18.
Sword Art Online: Alicization light novels compared to the anime
The third season of the anime adaptation is based on the Sword Art Online: Alicization arc, which is the longest story arc thus far. According to the author’s afterword in light novel Volume 18, Kawahara actually wrote the entire Alicization story in web novel format starting in January 2005 and finishing in 2008.
Years later, Kawahara wrote a web novel called Cradle Of The Moon, which is an Underworld side story that takes place shortly before the ending of Alicization. The Alicization story was adapted into light novel volumes 9 through 18, while volumes 19 and 20 were called Moon Cradle part 1 and 2.
The third season of the anime adaptation will adapt the entire Alicization arc. The pacing should be a bit faster in comparison to previous seasons since there are 10 books to cover in comparison to the eight books adapted by the first two seasons.
Already, fans are starting to make comparisons between the light novel and the anime. The biggest difference in Episode 1 was the action scene set in Gun Gale Online, which showed off a GGO Asuna. That scene was completely anime original, but it was a nice addition which gave a break from the info dumping that took place in the latter half of Episode 1.
The bad news is that Kawahara currently has not released enough books for Sword Art Online Season 4 to be produced immediately following the third season. The good news is that he’s hard at work on the sequel.
Note: This article will be updated over time as new SAO: Alicization episodes release.
Will there be a Sword Art Online: Moon Cradle movie?
The biggest question mark is what Aniplex plans on doing with the two book volumes related to Sword Art Online: Moon Cradle. Although Moon Cradle takes place chronologically before the end of the Alicization arc, it’s very unlikely that the Alicization anime will adapt the Moon Cradle arc.
In writing the story, Kawahara said the Moon Cradle web novel was originally “structured to be readable as an independent fantasy story with some character names in common (with the original works).” Therefore, adapting the light novels in chronological order would seriously disrupt the flow of the story in the Alicization anime.
Without getting into major spoilers, Moon Cradle involves multiple SAO characters spending many years worth of virtual time within Underworld. The plot is self-contained and only indirectly relevant to Unital Ring so far (see the spoilers section below for more details).
But how do so many years transpire? In Episode 1 of SAO: Alicization, Kirito explained the concept of Fluctlight Acceleration, which allows a human FullDiving via the Soul Translator to experience time at an accelerated rate. This time dilation factor is usually maxed out at 1,500 in order to avoid filling up the Fluctlight memory, but near the end of Alicization, the Fluctlight Acceleration is cranked up way, way past the safety limits.
Before certain SAO characters are ejected from Underworld, Rath decides to delete all memories accumulated after the Fluctlight Acceleration rate was increased. That means Moon Cradle is a story about a lifetime of memories spent in Underworld that the characters no longer remember once they’re in the real world.
Moon Cradle is similar to Ordinal Scale in that it’s not necessary to watch the latter movie to understand the plot of the main anime series. Therefore, it would make sense for Aniplex to adapt the story as a Moon Cradle movie since it would give audiences something new to watch until Sword Art Online Season 4 is released.
Sword Art Online: Unital Ring sequel to be released in 2018
In early 2017, Kawahara had promised “one more big arc” that will go “back to the real world.” Starting with Sword Art Online Volume 21, the author plans on developing a new type of game idea that’s different from The Seed games (Alfheim, GGO, etc.), Underworld, and the augmented reality Ordinal Scale.
This means the new story arc requires that Kirito, Asuna, and all the other SAO characters start over. The story is also new ground entirely because it’s the first SAO story arc that is not based on a web novel.
Kawahara also left a message at the end of the Cradle of the Moon web novel which stated that the “battles of Kirito and Asuna, Leafa, and Sinon and others, and Alice will be continued” when “they are their descendants once again take up swords” in the “final, greatest battlefield: The War of Intelligence Space.” Whether or not that was a hint about the upcoming story arc remains to be seen.
Kawahara eventually announced that the new story arc will be called Sword Art Online: Unital Ring and that it will be a direct sequel to Alicization. The author explained that Unital Ring’s title is similar Ordinal Scale because both titles are a reference to a mathematical term, but that doesn’t mean the two story arcs are linked in any manner.
When fans asked if SAO: Unital Ring will be longer than Alicization, he replied, “Oh… I strongly hope not.” In recent interviews, Reki implied that Unital Ring might be the final ending when he declared, “If the anime is going to continue, my light novel will be over after Alicization.”
The release date for SAO Volume 21 is scheduled for December 7, 2018. For Dengeki Choukansha Fair 2018, a bonus short story called The End of the Summer and the Straw hat was released. (Warning: This story is set in-between Alicization and Unital Ring and it contains one major spoiler concerning Alice.)
What does Unital Ring mean for Sword Art Online Season 4? A-1 Pictures director Manabu Ono once stated in an official interview that he had spoken with Aniplex staff around the time the SAO: Ordinal Scale movie was being screen-tested and “they were planning to adapt the entire Sword Art Online series.”
While Ono did not specifically mention SAO: Unital Ring or the possibility of Sword Art Online Season 4, keep in mind that Kawahara had already publicly announced Unital Ring when this interview was published. Therefore, it’s not unreasonable to assume that an Unital Ring anime is in our future.
Sword Art Online Season 4 release date: Alicization ending in late 2019, Unital Ring anime possible by 2024?
As of the last update, Aniplex, A-1 Pictures, or any company related to the production of the anime has not officially confirmed the Sword Art Online Season 4 release date. Nor has the production of an anime sequel been announced.
Once the news is officially confirmed this article will be updated with the relevant information. In the meantime, it’s possible to speculate about when, or if, the Sword Art Online Season 4 premiere date will occur in the future.
Anime studio A-1 Pictures has already confirmed the number of episodes for the Sword Art Online: Alicization anime adaptation. The third season will be composed of four cours that adapt the entire Alicization arc, which means there will be 48 episodes in total.
A cour is a three-month unit of broadcasting time based on the physical seasons, so four cours means the four quarters of a full year. The official website does not specify whether all four cours of Sword Art Online Season 3 will air consecutively.
However, when the third season began airing the Alicization Blu-Ray/DVD volumes were only announced up through Episode 24, which may be a hint. It is possible, but not yet confirmed, that the third season will go on hiatus starting in April 2018 and then resume in July 2018. That would mean the finale, Sword Art Online Season 3 Episode 48, should air in December 2019.
Predicting the Sword Art Online Season 4 release date is a bit more difficult since the number of volumes for Unital Ring is unknown. However, assuming that it’s 10 volumes like Alicization, Reki Kawahara could conceivably be done with the new story arc by 2022 or 2023.
Anime projects take years to develop, so the earliest likely premiere date for SAO Season 4 is 2024 or beyond. Of course, if the final SAO story arc is shorter, that would dramatically change the timetable for any anime sequel.
As previously mentioned, creating a Moon Cradle movie makes sense, but another option would be to adapt Moon Cradle as a single-cour Sword Art Online Season 4. That would mean Unital Ring would be Sword Art Online Season 5. This option makes sense since it would fill in the long gap between the third season’s finale and the completion of Unital Ring.
Sword Art Online: Unital Ring anime spoilers
Note: This section of the article was written before the Sword Art Online Volume 21 release date and will be updated with more details once the book is released.
The year is 2026 and it has been half a year since the Ordinal Scale incident. Kirigaya Kazuto (real-life name of Kirito) was attacked by Johnny Black, a former member of the Laughing Coffin murder guild, at the end of June before Summer Break. Although Kirito spent years of virtual time in Underworld, he woke from his coma in the real world on August 1, 2026.
After a long recovery, Kirito returned home and it’s now only ten days away from him becoming eighteen years old on October 7th. (Coincidentally, the Alicization anime premiered on Kirito’s birthday.)
The prologue for SAO Volume 21 makes a big deal about highlighting the respective birthdays of Kirito and Asuna, as well as Kirito’s musings about how his life could have gone differently if his parents had not died in a car accident when he was a baby. Since his real name was Narusaka Kazuto before he was adopted, Kazuto comically believes he may have used the gamer character named Naruto instead of Kirito.
Asuna will also be 18 soon, as well. Since both main SAO characters will soon be of legal age, it would not be surprising if the Unital Ring story arc features a Kirito and Asuna wedding. Although, Alice may have something to say about that since she and Kirito grew very close during their time in Underworld.
Since emerging from Underworld, Alice has lived in the real world with a humanoid mechanical body complete with schoolgirl clothing. When Alice met Kirito’s parents she treated them as if she were Kirito’s wife in the way she addressed them.
Asuna was incensed and threw down the gauntlet, promising to end the love feud ceasefire they’d established in Underworld. All poor Kirito could do was attempt to hide from the two girls chasing him down.
Kirito and Asuna had many of their memories of Underworld suppressed but not completely forgotten. While Kirito is upset that he can only remember mere fragments of memories from Underworld, Asuna quips that she’s okay with losing some memories since she believes he was busy getting into trouble with other women. Needless to say, Kirito probably wishes he could reboot his love relationships, not just his memories.
Back in the real world, Kirito and his virtual daughter Yui are discussing what sort of birthday present to buy for Asuna. Since being designed by Kayaba Akihiko, creator of SAO and The Seed, Yui has grown greatly as a self-aware top-down artificial intelligence. It’s even hinted that Yui’s capabilities may have grown to the point that she’s in control of Japan’s supercomputers.
Kirito eventually decides to dive into New Aincrad, the recreation of the floating castle. Maintained in Alfheim Online, the floors are now open up through Floor 50 and players are slowly working their way up to the top. But Kirito desires quiet so he can focus on catching up on school homework so he transports to the small log cabin that he and Asuna originally built on Floor 22.
Almost finishing up on his report, Kirito hears the sound of footsteps and mistakenly thinks the blue-haired Asuna has entered. Instead, it’s the blonde-haired Alice, who has become a Caith Sith cat knight in Alfheim because it was the easiest way to become a dragon-flying Dragon Knight.
Alice had announced herself to the world in a grand speech at a press conference and now she’s advocating human rights for AI. She’d gained notoriety with gamers for the way she chewed out PKers for the way they behaved. But she also enjoyed relaxing in Alfheim since it was similar to Underworld.
Due to Fluctlight Acceleration, 200 years had already passed in Underworld since Integrity Knight Alice Synthesis Thirty had vanished. When Kirito, Asuna, and Alice last snuck intoUnderworld, the technology had developed to the point that people were living in space colonizing planets and Pilots, not Integrity Knights, were flying mechadragons. All three characters were regarded almost as a legend by the newest generation of AI humans living in the Human Empire.
Fluctlight copies of Kirito and Asuna had lived on in this world (the events of Moon Cradle). They became Underworld’s “King and Queen of the Stars” and Kirito believes his virtual counterpart had died 30 years ago in virtual time. But the Rath corporation had reset the Fluctlight Acceleration so that time in Underworld was running at the same pace as reality.
Despite being disconnected from Underworld for so long, Alice hoped to resurrect her sister, Selka Zuberg, who survived in Deep Freeze inside the Central Cathedral. Alice also hoped to re-hatch the dragon siblings and raise them again.
Eventually, Asuna logs in and joins Kirito and Alice inside the log cabin. Alice and Asuna are outwardly civil toward each other but Kirito definitely notices the mood change when the two women are in the same room together.
Without warning, Kirito’s wooden cabin is shaken by a massive earthquake, which should be impossible in the virtual realm. Everyone is shocked when the sky turns red with a hexagonal pattern that perfectly mirrors the system-wide event that trapped everyone in Sword Art Online.
What does it all mean? The title Sword Art Online: Unital Ring may be a reference to worlds uniting. Sword Art Online: Alicization blurred the lines between realities based on the way events transpired in both Underworld and Ocean Turtle. In the case of Unital Ring, both the virtual world and the real world may experience an event similar to the original SAO.
The beginning of the prologue also offers a major hint, as well. What Kirito does not realize is that Higa Takeru, the chief developer of the Soul Translator, not only saved the physical bodies of Kirito and Asuna, he also saved a copy of Kirito’s 200-year-old soul.
This copy of Kirito spent years living in Underworld and he startles Higa with a prophecy that the doors to reality would open. This Star King also makes this cryptic message:
“I’d be known in Underworld as the Star King, just as Asuna would be known as the Star Queen. Kazuto and Asuna rediscovered all of Quinella’s secrets, used them, reforged the world, eliminated all barriers between civilizations, united the four kingdoms with the monsters living in the Dark Territories… And then conquered space itself.”
Before the scientist can do anything Star King escapes the Ocean Turtle lab virtually, jumping onto the internet and disappearing into the United States. Star King believes the future of Augmented Reality and VR lies in America and he’s also trying to track down a certain individual who displays real-world abilities similar to Accel World.
Why is this relevant? During the opening paragraphs of Sword Art Online: Unital Ring, Star King and the soul of Kayaba Akihiko apparently have a virtual chat. They are discussing the future of the Nexus, the whole interconnected network of VR worlds that sprung forth from The Seed. Simply acting as observers, Star King and Kayaba are uncertain whether the Nexus will wilt and die or evolve to the next stage: Unification.
Does that mean Unital Ring will have VR worlds and reality collide? Unfortunately, anime fans have quite the wait until Sword Art Online Season 4 sees our reality. Stay tuned!
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