Osomatsu-kun is a comedy manga series by Fujio Akatsuka which ran in Shogakukan's Weekly Shōnen Sunday magazine from 1962 to 1969. The series revolves around a group of sextuplet brothers who cause all sorts of mischief. It has been adapted into two different anime series of the same name, the first of which was produced by Studio Zero in 1966, and the second by Studio Pierrot in 1988. These were aired across Japan by Fuji Television, Animax, and the South Korean kids channel Cartoon Network Korea. A new anime series by Pierrot, Mr. Osomatsu, began airing in October 2015 to celebrate Akatsuka's 80th birthday, with a manga adaptation by Masako Shitara serialized in Shueisha's You magazine from January 2016.