A Certain Scientific Accelerator

A Certain Scientific Accelerator (Japanese: とある科学の一方通行（アクセラレータ）, Hepburn: Toaru Kagaku no Akuserarēta) is a Japanese manga series written by Kazuma Kamachi and illustrated by Arata Yamaji. It is a spin-off of A Certain Magical Index light novel series, which focuses on Academy City's most powerful Level 5 esper named Accelerator. The manga was serialized by ASCII Media Works through their monthly magazine Dengeki Daioh from December 2013 to July 2020 and published in English by Seven Seas Entertainment. Kamachi and Teto Tachitsu wrote and illustrated its manga spin-off titled A Certain Idol Accelerator-sama, which was published from October 2015 to November 2018. An anime television series adaptation by J.C.Staff aired from July 12 to September 27, 2019.

After protecting Last Order at the cost of much of his power, Accelerator now finds himself dragged into a new conflict in the form of a sinister organization called Disciplinary Action which plots to use Last Order for a dangerous mission. Now that they have set their plan into motion and are in pursuit of the young girl, it is up to the world's most powerful esper and his newfound companion, Esther Rosenthal, to protect Last Order and defend Academy City in the process.

The October 2013 issue of Dengeki Daioh magazine announced a manga spin-off of A Certain Magical Index series to be written by Kazuma Kamachi and illustrated by Arata Yamaji and Kiyotaka Haimura, which began serialization in the magazine's February 2014 issue on December 27, 2013. On March 25, 2015, Seven Seas Entertainment announced the English publication of A Certain Scientific Accelerator in North America. The manga concluded in the September issue of Dengeki Daioh on July 27, 2020.

A four-panel comedy manga spin-off of the series written by Kamachi and illustrated by Teto Tachitsu, titled A Certain Idol Accelerator-sama (とある偶像（アイドル）の一方通行（アクセラレータ）さま, Toaru Gūzō no Ippō Tsūkō-sama), began serialization in Dengeki Daioh from October 27, 2015 to November 27, 2018. It focuses on Accelerator's career as an idol, along with other Level 5 espers.

In October 2018, an anime television series adaptation of A Certain Scientific Accelerator was announced. The anime series is produced by J.C.Staff and directed by Nobuharu Kamanaka [ja], with Kenji Sugihara handling series composition and Yohei Yaegashi designing the characters. Maiko Iuchi, the composer of A Certain Magical Index and A Certain Scientific Railgun, was confirmed in March 2019 to be composing the series. The Sixth Lie and Sajou no Hana performed the opening and ending theme music titled "Shadow is the Light" and "Parole", respectively. Twelve episodes were aired in Japan on AT-X, Tokyo MX, BS11, and MBS from July 12 to September 27, 2019. The first Blu-ray and DVD volumes of the series were published on October 30, 2019, followed by the second and final volumes on December 25, and February 28, 2020.

Crunchyroll streamed the series worldwide outside of Asia beginning July 12, 2019, while Muse Communication began distributing it on their Muse Asia YouTube channel on the same date. Funimation streamed the series in the United States, Canada, the United Kingdom, Ireland, Australia, and New Zealand with an English dub beginning July 26, 2019, and Netflix released it in India on September 1, 2020. The series was released on Hulu in Japan on March 24, 2022.

The first volume of A Certain Scientific Accelerator sold 39,039 copies in the first week of its release, ranking 27th behind Kuroko's Basketball, and 54,093 copies in the second week, coming in twelfth.

Evan Minto of Otaku USA found A Certain Scientific Accelerator lacking an "establishing exposition" and noted its "confusing starting point" but commended Yamaji's "comfortable" handling of action scenes.

Theron Martin of Anime News Network rated the first episode of the series' anime adaptation 4 out of 5 stars, describing the overall production "at least... impressive" despite his concerns with Kamanaka and Sugihara due to their previous works and the show a "sharp enough addition to the franchise that... should not disappoint any established fan of the franchise".

• A Certain Scientific Accelerator at Dengeki Daioh (in Japanese)
• Official anime website (in Japanese)
• A Certain Scientific Accelerator (manga) at Anime News Network's encyclopedia
• A Certain Scientific Accelerator (anime) at Anime News Network's encyclopedia