Motto Marutto Railgun IV (もっとまるっと超電磁砲 IV Motto Marutto Rērugan IV?, lit. "Much More Railgun IV") is the fourth episode of the bonus short animation parody of the Toaru Kagaku no Railgun S anime. It was first released on November 27, 2013 as limited external manufacturer benefits bundled in the fifth Blu-ray and DVD releases of Toaru Kagaku no Railgun S.