月刊IKKI
"Futagashira" is written and illustrated by Natsume Ono. The series began in the July 2011 issue of Shogakukan's "Monthly Ikki", released on May 25, 2011. "Monthly Ikki" ceased publication on September 25, 2014, and the series was transferred to the then new brand magazine "Hibana", starting on March 6, 2015. The manga finished in the September 2016 issue of "Hibana", released on August 6, 2016. Shogakukan compiled its chapters into seven "tankōbon" volumes, released from December 27, 2011 to September 12, 2016.