Only my railgun

only my railgun is the first opening theme of the Toaru Kagaku no Railgun anime. It was first introduced in the first episode of the anime as an ending theme (initial TV airings only) and from the second episode up to Episode 14 as an opening theme (used in the first episode as the opening theme as well), it was replaced by LEVEL 5 -judgelight-. On the 12th and of the anime, it was used as an insert music.

Background
The song acts as a description of the titular character of the series, Misaka Mikoto, and her signature move, the Railgun.

Promotional Video
The promotional video of "only my railgun" depicts various characters from Toaru Kagaku no Railgun as played by people in masks. The only characters of note are Shirai Kuroko and Misaka Mikoto, and the rest of the characters in the video display various psychic abilities like psychokinesis, pyrokinesis, manipulation of water and others. One other actor in the video is a magician played by comedian Maggy Shinji, who performed various tricks, seemingly imitating the psychic powers in the video.

Tracklist
It was composed and arranged by Satoshi Yaginuma and was sung by Yoshino Nanjo, under their band name fripSide. This was their first single release since the departure of the previous vocalist. It was released on November 4, 2009, an entire month after the broadcast of the first episode.

The single features the full version of the song.
 * 1) "only my railgun" – 4:17
 * 2) "late in autumn" – 6:09
 * 3) "only my railgun" -instrumental- – 4:17
 * 4) "late in autumn" -instrumental- – 6:09

Characters
By appearance
 * Misaka Mikoto
 * Shirai Kuroko
 * Uiharu Kazari
 * Saten Ruiko
 * Yomikawa Aiho
 * Tessou Tsuzuri
 * Jufuku Miho
 * Kongou Mitsuko
 * Kamijou Touma
 * Kiyama Harumi
 * AIM Burst

Spoilers

 * The machine shown during the Child Error experiment.
 * The appearance of the AIM Burst creature.

Trivia

 * The scene in which Mikoto is near a vending machine being passed by Touma before being groped by Kuroko is a recreation of a similar scene in the first opening of the Toaru Majutsu no Index anime.
 * In the promotional video, Kuroko is depicted as both a Teleport and a Psychokinesis user.
 * She hums this theme at the end of thirteenth episode of Toaru Kagaku no Railgun.

Only my railgun