Monthly Shōnen Sunday (月刊少年サンデー), alternately known as Gessan (ゲッサン) (a portmanteau of "Gekkan" and "Sandē" from its full Japanese title), is a monthly shōnen manga magazine published in Japan by Shogakukan since May 12, 2009 (the June 2009 issue). The magazine was announced in February 2009, with Hayashi Masato, at that time editor of Weekly Shōnen Sunday, editing the monthly magazine as well. Manga artists who debuted new series or stories in the magazine include Yellow Tanabe, Mitsuru Adachi, and Kiyohiko Azuma.

Series

There are 27 manga series being serialized in Monthly Shōnen Sunday.

Finished series

2009

2010–2014

2015–2019

2020–present

Light novels