Toaru Radio no Railgun (とあるラジオの超電磁砲 Toaru Rajio no Rērugan?) is a radio show which promotes the Toaru Kagaku no Railgun anime. It first aired between September 18th 2009 and April 30th 2010 on the HiBiKi Radio Station. A second series, accompanying Toaru Kagaku no Railgun S and titled Toaru Radio no Railgun S (とあるラジオの超電磁砲S Toaru Rajio no Rērugan S?) aired between March 21st and December 29th 2013, with specials on CDs included in the Toaru Kagaku no Railgun S Blu-Ray releases.