Only My Railgun was released in 2009 by Japanese duo fripSide as the opening theme for A Certain Scientific Railgun, the spin-off centred on Misaka Mikoto and her electromagnetic railgun ability. The single became a major hit in Japan and helped define the series identity beyond the anime itself. Online, the opening riff spread through rhythm games, MAD videos and edit culture, where it still signals fast-paced anime action. Fans often group it with other instantly recognisable anime cues like Tuturu and Giorno's Theme in soundboards and compilations.