Gambling Emperor Legend Zero is a Japanese manga series written and illustrated by Nobuyuki Fukumoto. The first part was serialized in Kodansha's shōnen manga magazine Weekly Shōnen Magazine from September 2007 to March 2009, with its chapters collected in eight tankōbon volumes. The second part, Tobaku Haōden Zero: Gyanki-hen was serialized in the same magazine from July 2011 to May 2013, with its chapters collected in 10 volumes. The story revolves around gambling with high stakes, with focus on competition and rivalry.