Gag Manga Biyori is a 15-volume manga written by Ksuke Masuda and serialized by Monthly Shnen Jump and Jump Square from January 2000  November 2014.
15 Good Day for Gag Manga) is a manga serialized in Monthly Shonen Jump until July 2007 when the magazine ceased to publish. Kosuke Masuda The manga continued serialization in its monthly successor, Jump Square. January 2000  November 2014 
