Sister's noise

sister's noise is the first opening theme for the second season of the Toaru Kagaku no Railgun Manga, Toaru Kagaku no Railgun S, and single by fripSide that released on May 8, 2013.

Tracklist
The opening for To aru Kagaku no Railgun S was composed and arranged by  Satoshi Yaginuma and sung by Yoshino Nanjo under their band name fripSide. The single release features the full version of the song.
 * 1) "sister's noise" - 1:30 (TV version)
 * 2) "I'm believing you"
 * 3) "Sister's noise" -instrumental-
 * 4) "I'm believing you" -instrumental

Characters
By appearance
 * Misaka Mikoto
 * Shirai Kuroko
 * Saten Ruiko
 * Uiharu Kazari
 * Kamijou Touma
 * Frenda Seivelun
 * Takitsubo Rikou
 * Kinuhata Saiai
 * Mugino Shizuri
 * Accelerator
 * Nunotaba Shinobu
 * Misaka Sister
 * Haruue Erii
 * Konori Mii
 * Kongou Mitsuko
 * Wannai Kinuho
 * Awatsuki Maaya
 * Shokuhou Misaki

Spoilers

 * Mikoto battling Frenda Seivelun and Mugino Shizuri.

Trivia

 * Sister’s noise is probably short for Sisters' Radio Noise.
 * The opening video contains the most Level 5s in any opening video of the Toaru Majutsu no Index animated adaptations.