Rokudenashi Blues (Japanese: ろくでなし BLUES, Hepburn: Rokudenashi Burūsu, lit. "Good-for-Nothing Blues") is a Japanese boxing-themed yankī manga series written and illustrated by Masanori Morita. It was serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump from May 1988 to February 1997, with its chapters collected in 42 tankōbon volumes. Rokudenashi Blues had over 60 million copies in circulation as of August 2013, making it one of the best-selling manga series.