Disciplinary Action (ディシプナリ・アクション Dishipunari Akushon?), known mostly as DA, is a rogue group within Anti-Skill that is obsessed with bringing justice to Academy City to the point of extremism and zealotry.
On paper, the DA is referred to as a cooperative organization within Anti-Skill. The organization began originally as a group of those who received disciplinary action for going overboard in their law enforcement. In reality however, it is a secret society that will use any means necessary to carry out what they call "justice".
Much about the group is currently unknown, though they have extreme beliefs against the "evils" plaguing Academy City are apparently willing to kill and use secretive methods to do it, like the Coffins.
Despite their actions, the organization apparently gathers many sympathizers, allowing it to grow. From these sympathizers, the organization receives information, funding, and technology, enough for them to even boast that they can oppose the Board of Directors. These people range from current and former Anti-Skill members to the highest echelons of Academy City such as Nakimoto Rizou.
However, due to their zealotry and extreme actions, it is not uncommon for higher-ups to oppose them after growing fed up with their actions. Indeed, Nakimoto Rizou, who finances the organization, eventually decides that they are trouble and hires Scavenger against them.
Nishio states that the organization's "mission statement" is to mercilessly crush evil. According to Esther Rosenthal they are apparently trying to add a new layer to the world using Last Order, endangering not only the city but the entire world.
The organization is composed mostly of members of Anti-Skill that have been given "disciplinary action" for going overboard in their law enforcement duties. They are the ones that carry out the missions for the organization. As stated above, the organization draws in sympathizers, from which they get the other members of the organization, such as influential people, rejected defense contractors, and even dangerous neuroscientists.
Members of the organization are apparently very zealous in bringing justice, and shows no reservations on purging other members who are deemed as cowardly.
Yomikawa Aiho succinctly states that DA is like all of Anti-Skill's "darkness" has been gathered all in one place.
In the anime, DA appears to use codenames in audio conferences, with higher-ups or backers (such as Nakimoto Rizou) using numbered Breeder (ブリーダー?) codenames (with a red icon with an emblem of a hand holding a spiked leash), and other members using codenames derived from breeds of hound (with a blue icon with dog emblems), such as Basset Hound for Nishio and Dachshund (ダックスフント?) for Hishigata Mikihiko.
DA Arouse (DAアラウズ?) is a branch of DA that appears in Toaru Kagaku no Dark Matter. While another DA branch was busy with Accelerator and Esther Rosenthal, DA Arouse were instead preoccupied with trying to capture Yuzuriha Ringo but were foiled by Kakine Teitoku.
On top of their standard Anti-Skill equipment, the organization is supplied by technology by their sympathizers. Their technology is enough for them to boast that they can oppose the Board of Directors with them. Even Yomikawa Aiho admits that their technology far surpasses the Anti-Skills own top technology.
In the anime, DA members have helmets with retractable visors, which display a red outline of jagged teeth as they are lowered. and are equipped with FN Herstal P90 submachine gun and Walther P99 pistol. They also have access to a taser pistol with 4 barrels. 
Below is a list of technology that is unique to the organization:
- Chameleon Camouflage
- Nephentesion No. 7
- Random Number Ultrasonic Blade
- Anti-Esper Armor: An armored suit designed for use against espers. It is comprised of a composite metal armor with shock absorbing gel within which can negate attacks. Included is an electrified double-pronged polearm that acts like a cattle prod and resembles either a bident or sasumata.
- Riot Suppression Acoustic Weapon: A weapon installed on the roof of DA Arouse's automobile. It has enough power to temporarily impede Kakine Teitoku and allow the group to escape with their injured members.
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Several days before the incident at Heaven Canceller's Hospital, several DA members came across Hitokawa Hasami after a failed suicide attempt and murdered her in the ambulance in order to make use of her ability in the Prototype Coffin.
Toaru Kagaku no Accelerator
- Main article: Necromancer Arc
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Ch7-18: Scavenger/Anti-Skill battles
While attempting to capture Esther Rosenthal at Heaven Canceller's Hospital, DA member Nishio came into conflict with Accelerator after the latter saw signs that someone was after Last Order, resulting in the Prototype Coffin's destruction and his subsequent termination. A couple of DA members later attempted to destroy Hitokawa Hasami's corpse in the morgue to eliminate any evidence pointing to them, but were thwarted by Accelerator and Esther's Huotou. During their escape, one of them abducted Misaka 10046 in place of Last Order.Following the incidents at the hospital, Nakimoto Rizou decided to get rid of DA and dispatched Scavenger to deal with them. At the same time, previously hidden information on organization became accessible to Anti-Skill, resulting in DA coming under attack from both groups. With their branches under attack, DA hoped Hishigata's weapon would turn the tables and aimed to get the abducted Misaka 10046 to him at Seiin High School after being told she was necessary for it to work, though Hishigata intended to sever ties with DA as soon as he got the Sister. The Tarantula was deployed to this end, killing many Anti-Skill operatives but ultimately falling foul of Scavenger. Meanwhile, the other remaining DA units converged on Seiin High School and its 6th Chemistry Building.
During the events at Seiin High School, numerous members of DA which had gathered there were consumed by the Taowu's growing body as the impatient Isaac Rosenthal tried to speed up the process, resulting in him being overwhelmed by their desires to enforce "justice", losing control over the Taowu as a result. Following the Taowu's destruction, the organization was left destroyed.
Toaru Kagaku no Dark Matter
This section requires expansion
This section requires expansion
Notes & Ep5 list
|Nishio||Basset Hound||Tasked with capturing Esther Rosenthal. Terminated after failing mission and losing the Prototype Coffin.|
|Hishigata Mikihiko||Dachshund||Neuroscientist and developers of the Coffins. Using the group for his own objectives.|
|N/A||Irish Wolfhound||Involved in the audio conference after Nakimoto terminated his support for DA.|
|N/A||Pharaoh Hound||Involved in the audio conference after Nakimoto terminated his support for DA.|
|Mogari Takumi||Whippet||Disappeared from Anti-Skill after using excessive force and leaving a student half-paralyzed. Sent to dispose of Hitokawa Hasami's corpse.|
|Manabe Ritsuki||Saluki||Charged after illegally selling Anti-Skill equipment to other organizations to exterminate terrorists. Sent to dispose of Hitokawa Hasami's corpse.|
|Kamata Kouta||N/A||Only profile picture, name, and blood type appeared on Yomikawa's laptop during Anti-Skill's investigation.|
|Kawakita Yuu||N/A||Only profile picture, name, and blood type appeared on Yomikawa's laptop during Anti-Skill's investigation.|
|Honda Kaito||N/A||Only profile picture, name, and blood type appeared on Yomikawa's laptop during Anti-Skill's investigation.|
|N/A||Borzoi||Involved in the audio conference as Anti-Skill were attacking DA.|
|N/A||Afghan Hound||Involved in the audio conference as Anti-Skill were attacking DA.|
|N/A||Greyhound||Involved in the audio conference as Anti-Skill were attacking DA.|
|Izaya Hase||N/A||Listed in paper. DA serial number: 0160-19963|
|Koharu Otonari||N/A||Listed in paper. DA serial number: 0072-30007|
|Shion Kiyokawa||N/A||Listed in paper. DA serial number: 0181-98555|
|Daishin Tsushiro||N/A||Listed in paper. DA serial number: 0158-00495|
|Yuuhou Kumimura||N/A||Listed in paper. DA serial number: 0226-48709. Gender: Male|
|Izuru Amikura||N/A||Listed in paper. DA serial number: 0175-35989|
|Nishiki Tsukuno||N/A||Listed in paper. DA serial number: 0175-82020, Gender: Female, Age: 28|
|Aoba Suguro||N/A||Listed in paper. DA serial number: 0211-68733, Gender: Female|
|Sijyuu Nishimori||N/A||Listed in paper. DA serial number: 0098-72569, Gender: Male, Age: 35|
|Kazunari Furusa||N/A||Listed in paper. DA serial number: 0183-12547, Gender: Male|
|Teruhi Jyosai||N/A||Listed in paper. DA serial number: 0218-36547, Gender: Male|
|Sora Hakugawa||N/A||Listed in paper. DA serial number: 0139-38022|
|Keisyou Namiki||N/A||Listed in paper. DA serial number: 0211-50011|
|Yagumo Aramaki||N/A||Listed in paper. DA serial number: 0148-26630|
|Kimitaka Miyaishi||N/A||Listed in paper. DA serial number: 0169-77362|
|Honoo Kawanoue||N/A||Listed in paper.|
|Nagito Tama||N/A||Listed in paper.|
|Kouki||N/A||Listed in paper.|
|Takamori||N/A||Listed in paper.|
|N/A||N/A||Leader of DA's branch Arouse. Attempted to abduct Yuzuriha Ringo and wore Anti-Esper armor|
The individuals operating under the Breeder codenames might not necessarily be part of the organization itself, but those who aren't higher-ups in DA itself do provide major support and backing to the group (such as Nakimoto Rizou, prior to him terminating his support).
|N/A||Breeder 01||Involved in the audio conference following Nishio's failure. Unidentified.|
|N/A||Breeder 02||Involved in the audio conference following Nishio's failure. Unidentified.|
|N/A||Breeder 03||Involved in the audio conference following Nishio's failure. Unidentified.|
|N/A||Breeder 04||Involved in the audio conference following Nishio's failure. Unidentified.|
|N/A||Breeder 05||Involved in the audio conference following Nishio's failure. Unidentified.|
|N/A||Breeder 06||Involved in the audio conference following Nishio's failure. Unidentified.|
|Nakimoto Rizou||N/A||Member of the Academy City Board of Directors. Supported the group and kept information from Anti-Skill's access, thinking that DA might be useful for him. Terminated support after seeing that the group were becoming a liability and dispatched Scavenger to dispose of them. Breeder code number unknown.|
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Toaru Kagaku no Accelerator Manga Chapter 007
- ↑ 2.0 2.1 2.2 2.3 Toaru Kagaku no Accelerator Manga Chapter 001
- ↑ 3.0 3.1 3.2 3.3 Toaru Kagaku no Accelerator Manga Chapter 002
- ↑ 4.0 4.1 4.2 4.3 4.4 Toaru Kagaku no Accelerator Manga Chapter 006
- ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 5.11 5.12 5.13 5.14 5.15 Toaru Kagaku no Accelerator Episode 02
- ↑ 6.0 6.1 6.2 6.3 Toaru Kagaku no Dark Matter Manga Chapter 001
- ↑ 7.00 7.01 7.02 7.03 7.04 7.05 7.06 7.07 7.08 7.09 7.10 7.11 7.12 7.13 Toaru Kagaku no Accelerator Episode 04
- ↑ 8.0 8.1 Toaru Kagaku no Accelerator Manga Chapter 003
- ↑ Toaru Kagaku no Accelerator Manga Chapter 004
- ↑ Toaru Kagaku no Accelerator Manga Chapter 005
- ↑ Toaru Kagaku no Accelerator Episode 03
- ↑ 12.0 12.1 12.2 Toaru Kagaku no Accelerator Manga Chapter 008
- ↑ Toaru Kagaku no Accelerator Manga Chapter 009
- ↑ Toaru Kagaku no Accelerator Manga Chapter 010
- ↑ 15.00 15.01 15.02 15.03 15.04 15.05 15.06 15.07 15.08 15.09 15.10 15.11 15.12 15.13 15.14 15.15 15.16 15.17 15.18 15.19 15.20 15.21 15.22 15.23 Toaru Kagaku no Accelerator Episode 05
- ↑ Toaru Kagaku no Accelerator Manga Chapter 032
- ↑ Toaru Kagaku no Accelerator Manga Chapter 033
- ↑ Toaru Kagaku no Accelerator Manga Chapter 036
|Dark Side of Academy City
|Factions and Organizations
|Board of Directors (Former Board Chairman) (Current Board Chairman)|
|Experiments and Projects
|Key Events (Timeline)
|See also: Academy City