Invisible Black Matter (インビジブルブラックマター Inbijiburu Burakku Mata?) abbreviated as IBM, are the main source of an Ajin's powers. IBM cannot be seen by people who are not Ajins. As theorized by Ikuya Ogura, IBM is what allows the Ajin to replace any lost body tissues or nutrients as demonstrated when an IBM oozes from the body of an Ajin when they're fatally wounded or when they're manifesting their Black Ghost. The origins of IBMs are still unknown as are their composition; IBM's are made up of intangible unknown matter that originates from an Ajin's body. Ajins also possess the ability to manifest themselves into Black Ghosts. Black Ghosts and IBM are different in the sense that all Ajins possess IBM, but not all of them can manifest a Black Ghost. Nakano is one such person who can't manifest a Black Ghost. These Ghosts are made up of IBM and normally have a humanoid form but can have inhuman characteristics, standing at about over two meters tall. Each Ajin can manifest a unique Black Ghost. Ghosts are usually used for combat purposes, but they can also be utilized in other ways if their hosts know how to control them properly. They only have one weak point: their heads. Only a fatal blow to the head by another Ghost can destroy a Ghost.
39;s Negligence to control them or failure to do so.
The connection between an Ajin and their Ghosts can also be hindered by water; analogous to how a cell phone's signal can be disrupted when there's heavy rain. If an Ajin and their Ghost's 'connection' are severed, the Ghost will vanish eventually. Ajins can manifest Black Ghosts when they're aware that they're Ajin (usually when they die), although Nakano hasn't manifested his Ghost despite dying multiple times already. When 2 Black Ghosts' heads make contact, the memories of the Ajins that own them also 'collide', resulting in a brief moment where their respective hosts are able to see a memory from the other Ajin. During this collision they also trade their mental states such as fear. This happened first with Kei Nagai and Satō's Ghosts. These Black Ghosts also seem to have a will of their own and are shown to be quite intelligent. Black Ghosts often mimic the 'core' personality of their host, as seen in Nagai and Sato's cases. Black Ghosts can also mimic their host's speech as demonstrated by Sato and Kei. However, there are also cases where Black Ghosts are left to their own will due to their host's Negligence to control them or failure to do so. One case included a farmer that left their Ajin to it's own will, and it eventually taught itself things such as farming or riding a tractor.
If left alone for too long, it will be much harder to control them, as in Kei's case, who didn't know he had a Black Ghost for almost his entire life as he hadn't realized that he had died in the past. It is interesting to note that Satō, Tanaka, Izumi, Okuyama, Takahashi and Kotobuki are able to control their IBM's completely. Kei's IBM simply does whatever it wants, even completely ignoring Kei. While other Ajins are able to command their Ghost properly and can share their Ghost's field of vision and command it to attack targets, Kei is unable to do so. His Ghost is reckless, and often attacks anyone in its immediate vicinity. It is also possible for Black Ghosts to have wings, as in Takeshi Kotobuki's case. It is unknown whether or not this is possible for other Ajins as well due to each Ajin's Ghost being unique. Ikuya also suggests that Black Ghosts have the capability to change if their users are able to change their personalities. However, it is yet to be seen if it's actually possible. If an Ajin dies when experiencing a once in a life time heightening of emotions, they are able to cause a "flood" of IBM's and cause havoc by summoning multiple Black Ghosts that they can't control. 10-20 IBMs are generated depending on the density of the Black Ghost of the user. However, this is a very rare occurrence; the only known cases of a Flood occurring in Japan happened with Nakamura's and Kei in the anime. In some cases of a flood nearby people who had recently died may be affected.
During the Shinya Nakamura incident, Yūsuke died due to cardiac arrest despite being shot in the chest. The gunshots had healed but he couldn't reach the point of becoming an Ajin. In other words he was on the threshold. It is unknown if Yūsuke would have come back if he received CPR. A scientist from the US believes that this phenomenon is a hint to how Ajins are born but Ikuya Ogura argues that this is due to how strong the Ajin's emotions are at the moment of the flood. The IBMs created during a flood continuously act according to the emotion that triggered it's appearance. There was a case where a dutch gold medallist fell over and died right after reaching the finish line. The joy of victory combined with his revival caused a flood where the IBMs were rejoicing. The gold medalist attempted to order them to leave but they refused to listen. In Shinya Nakamura's case it was malice that triggered the IBMs and if any pedestrians were nearby they would have also been killed.
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.
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).
Manga - An Overview
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 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 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).