The story is set in a world where supernatural powers exist through science, and magic exists through religion.

Academy City is home to 2.3 million inhabitants, which include ordinary civilians and ESPers: individuals with special abilities. 80% of the students in Academy City are active in the "Power Curriculum Program", and out of that 80%, only 7 are classified as Level 5 ESPers.

Meet Level 5 "Electromaster" Misaka Mikoto and her friend Shirai Kuroko, who both work together in maintaining peace within Academy City's university district as members of "Judgment", Academy City's student-based disciplinary committee.

"Toaru Kagaku no Railgun" ("A Certain Scientific Railgun") is a side story of "Toaru Majutsu no Index" ("A Certain Magical Index").

Related:

> Toaru Majutsu no Index (Light Novels)
(http://www.baka-tsuki.org/project/index.php?title=Toaru_Majutsu_no_Index)

> Toaru Majutsu no Index (Main Story)
(https://bato.to/comic/_/comics/to-aru-majutsu-no-index-r635)

> Toaru Majutsu no Index X Toaru Kagaku no Railgun 4Koma Anthology
(https://bato.to/comic/_/comics/4-koma-koushiki-anthology-toaru-kagaku-no-railgun-x-toaru-majutsu-no-index-r4804)

>Toaru Kagaku no Accelerator
(https://bato.to/comic/_/comics/toaru-kagaku-no-accelerator-r10196)