週刊少年サンデー
is a weekly "shōnen" manga magazine published in Japan by Shogakukan since March 1959. Contrary to its title, "Weekly Shōnen Sunday" issues are released on Wednesdays. "Weekly Shōnen Sunday" has sold over 1.8billion copies since 1986, making it the fourth best selling manga magazine, only behind "Weekly Shōnen Jump", "Weekly Shōnen Magazine" and "Weekly Young Jump".