Toaru Majutsu no Index

Japanese Title: とある科学の超電磁砲（レールガン）

English Title: A Certain Scientific Railgun

Chinese Title: 科學超電磁砲

Korean Title: とある科学の超電磁砲（レールガン）

First Season: Toaru Kagaku no Railgun
Academy City is a highly developed place in terms of technology. It is said to be 20 to 30 years ahead of the rest of the world. Eighty percent of its 2.3 million residents are students. The focus of studies here is directed towards esper powers. Misaka Mikoto, one of the top level espers in town, shares a room with Kuroko Shirai, another high level esper who is a member of Judgement, a law enforcing agency composed of students. Both attend to Tokiwadai, a private school reserved for the high-leveled and the rich. Kuroko's partner at Judgement, Kazari Uiharu, is a low level esper who studies at Sakugawa middle school. Her best friend and classmate there is Ruiko Saten, a level zero (no esper powers). Together, the four encounter several adventures in the exciting scientific town.

OVA: Toaru Kagaku no Railgun
After the Level Upper incident, Misaka Mikoto has a strange sensation that someone is watching her. Different from the usual attention she gets, this piercing sensation starts to disturb her greatly. Committed to help her roommate, Kuroko Shirai asks their mutual friends Kazari Uiharu and Ruiko Saten to help solve this mysterious case.

Second Season: Toaru Kagaku no Railgun S
Mikoto Misaka, one of the strongest Level 5 espers in Academy City, gave her DNA map to a certain doctor when she was young, believing that it may be used for greater good. Unfortunately for her, it ended up being used to create countless clones of herself; forming the Misaka network, in order to create the strongest esper by sacrificing these clones whom she considers as her own sisters.