とある魔術の禁書目録外伝 とある科学の一方通行 [Toaru Majutsu no Index Gaiden: Toaru Kagaku no Accelerator]

A spin-off from the Toaru Majutsu no Index universe, this series shifts focus to Accelerator, the Academy City's most powerful esper, as he takes on a reluctant role as a protector. Written by Kazuma Kamachi with art by Arata Yamaji, the story explores his attempts to atone for past sins while confronting new threats that test his formidable abilities. Published by Kadokawa from 2014 to 2020 across 12 issues, it deepens the world of esper powers and moral ambiguity that defines the franchise.