A Certain Scientific Accelerator (とある科学の) 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.
Plot
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.