Monthly Sunday Gene-X (月刊サンデーGENE-X,Gekkan Sandē Jenekkusu?), often abbreviated as often abbreviated as Sunday GX (サンデーGX,Sunday GX?), is a Japanese seinen manga magazine published by Shogakukan. The Jormungandmanga was published in it from May 2006 through January 2012.
During Season 1 of the anime Sunday GX ran a character and story arc poll that ran from June through September 2012.