- As of June 10, 2021, eight volumes have been published as part of the Progressive series.
- Sword Art Online 14. Yen On.15 (in Japanese).
The answer to this question is not in the anime. It's one of the main plot points in the work, and fully explained in the manga. Actually, MOST of what Shiro is is explained in the last chapters of the manga. So, you are NOT supposed to get her from the anime. Shiro is not a prisoner. She is actually a test subject from a research laboratoryy, the reason why the Branches of Sin exist, and the responsible for the earthquake that destroyed Japan. The prison was built later, above the lab she was experimented on, as a facade for the testing on people who developed Branches of Sin after the earthquake. She escaped the prison simply because there is no real way to contain her at all. Yes, she killed all of Ganta's classmates out of jealousy. In the past, Ganta knew Shiro, because his mother was on of the chief researchers at the laboratory, extremely involved in the inhuman experiments the girl was subjected to. Gantas cared a lot for Shiro, and she liked him a lot too. They pretended to be each other's hero, "Aceman".
But in one experiment, a broken Shiro decided to kill some researchers to show her control over her developing powers, and Ganta ended up witnessing it. The shock made him forget what he saw, and forget about Shiro. He was then sent away to live in the city. Some time later, Shiro would cause the earthquake trying to die. She still survived, and Ganta's mother built a system to seal the girl's powers to an extent, so she would not be able to try that again. She also gave the girl a small red stone she had developed in the laboratory. It was a substance that could null Shiro's powers. Ganta's mother then killed herself so no one would be able to deactivate the system and free Shiro's powers. The years went on, and one day, due to the school's scheduled visit to the prison, Shiro found out that Ganta was living in the city and where he studied. She ran away from the laboratory to find Ganta. She ends up killing all Ganta's classmantes for jealousy, and inserts the power to null her powers into Ganta, hoping he will then become her hero and save her, by killing her. She wanted to be killed by the boy she loved.
As of June 10, 2021, eight volumes have been published as part of the Progressive series.
Sword Art Online is a Japanese light novel series written by Reki Kawahara with accompanying illustrations drawn by abec. The series takes place in the near-future and focuses on various virtual reality MMORPG worlds. ASCII Media Works began publishing the novels on April 10, 2009 under their Dengeki Bunko imprint. Russia. With more than 16 million copies in print worldwide, there are future plans for publications in Germany, Italy, Austria, Switzerland, Vietnam and others. Kawahara also began writing a parallel series of light novels titled Sword Art Online: Progressive, a spin-off that focuses on the clearing of Aincrad, unlike the Aincrad stories of the main series. As of June 10, 2021, eight volumes have been published as part of the Progressive series. In addition to the original storyline of Sword Art Online and Sword Art Online: Progressive, Kawahara has also written and published Sword Art Online side stories. Accel World, have been sold at Comitia, Dengeki Bunko's Fair and have come along with the limited edition Blu-Ray/DVD Sword Art Online compilation volumes.
Extra on Manga
Before Sword Art Online was published, Kawahara had posted Sword Art Online novels on his website and there are still a few side stories on Sword Art Online, although the original novels have been removed. In addition, Kawahara has published a side story of Sword Art Online in one of his other works, Accel World. In the tenth volume of Accel World, there is a chapter where it depicts a cross over between Sword Art Online and Accel World. Several of the side stories that he has released are in a collection called the Sword Art Online Material Edition, sold at the Comitia dōjinshi-selling event, which range from novels to manga. However, all of the art in the Material Editions is drawn by Kawahara himself. Aside from the light novels written by Kawahara, there are also two spin-offs written by other authors with supervision by him. The first one is Sword Art Online Alternative: Gun Gale Online series written by Keiichi Sigsawa and illustrated by Kouhaku Kuroboshi, while the other is Sword Art Online Alternative: Clover's Regret, written by Watase Souichirou and illustrated by Ginta. While both of these series take place in the same world as the main series written by Kawahara, they each feature different characters as the focus compared to the main series.
Afterword of the first light novel volume.(April 2009).1〉アインクラッド (電撃文庫) (in Japanese).26 V (in Japanese).(October 2012). 1 (電撃文庫) (in Japanese).(June 2021).8 (電撃文庫) (in Japanese). Kawahara, Reki.(in Japanese).
Life, Death and Manga
Sword Art Online"Light Novel and Manga Release Details Listed". Kawahara, Reki (22 April 2014). Sword Art Online 1: Aincrad.(10 August 2009).2〉アインクラッド (電撃文庫) (in Japanese). Sword Art Online 2: Aincrad.(10 December 2009).3〉フェアリィ・ダンス (電撃文庫) (in Japanese). Sword Art Online 3: Fairy Dance.(April 2010).4〉フェアリィ・ダンス (電撃文庫) (in Japanese). Sword Art Online 4: Fairy Dance.(August 2010). 5〉ファントム・バレット (電撃文庫) (in Japanese).
Sword Art Online 8. Yen On.(10 February 2012).(9) (電撃文庫) (in Japanese).
Sword Art Online 5. Yen On.(December 2010).(6) (電撃文庫) (in Japanese). Sword Art Online 6. Yen On.(April 2011).7〉マザーズ・ロザリオ (電撃文庫) (in Japanese). Sword Art Online 7. Yen On.(August 2011).8〉アーリー・アンド・レイト (電撃文庫) (in Japanese). Sword Art Online 8. Yen On.(10 February 2012).(9) (電撃文庫) (in Japanese). Sword Art Online 9. Yen On.(July 2012).10〉アリシゼーション・ランニング (電撃文庫) (in Japanese).
Sword Art Online 14. Yen On.15 (in Japanese).
Sword Art Online 10. Yen On.(December 2012). 11 (電撃文庫) (in Japanese). Sword Art Online 11. Yen On.(April 2013).(12) (電撃文庫) (in Japanese). Sword Art Online 12. Yen On.(10 August 2013).(13) (in Japanese). Sword Art Online 13. Yen On.14 (in Japanese). Sword Art Online 14. Yen On.15 (in Japanese). Sword Art Online 15. Yen On.(in Japanese).
Sword Art Online 16. Yen On. 17 (in Japanese). Sword Art Online 17. Yen On.18 (in Japanese). Sword Art Online 18. Yen On. Yen Press (November 12, 2019). "Hi! Thanks for bringing this to our attention. Sword Art Online 18 is being released January 7th. We'll be sure to have the paperback listing on our site updated as soon as possible".19 (in Japanese). Sword Art Online 19. Yen On.20 (in Japanese). Sword Art Online 20. Yen On.21 (in Japanese).22 (in Japanese).
23 II (in Japanese). 23 III (in Japanese).25 IV (in Japanese). Sword Art Online Progressive 1. Yen On.(December 2013).(2) (電撃文庫) (in Japanese). Sword Art Online Progressive 2. Yen On.(10 December 2014).(3) (電撃文庫) (in Japanese). Sword Art Online Progressive 3. Yen On.(10 December 2015).4 (電撃文庫) (in Japanese).