Mr. Osomatsu, known in Japan as Osomatsu-san, is a 2015 anime television series directed by Yoichi Fujita and produced by Pierrot, based on Fujio Akatsuka's Osomatsu-kun manga series. Celebrating Akatsuka's 80th birthday, the series follows the sextuplet Matsuno brothers as they now start living as adults.
The first season aired between October 5, 2015 and March 28, 2016 and was simulcast by Crunchyroll. Following its broadcast, the first episode was removed from streaming and is replaced by an original video animation episode in its home video release. A special episode, produced in collaboration with the Japan Racing Association, aired on December 12, 2016. For the first twelve episodes, the opening theme is "Hanamaru Pippi wa Yoi Ko dake" (はなまるぴっぴはよいこだけ The Hanamaru Whistle is Only for Good Kids) by AouP while the ending theme is "Six Same Faces ~Kon'ya wa Saikō!!!!!!~ (SIX SAME FACES ~今夜は最高!!!!!!~ Six Same Faces ~Tonight is the Best!!!!!!~) by Iyami (Kenichi Suzumura) and the Matsuno brothers (Takahiro Sakurai, Yuichi Nakamura, Hiroshi Kamiya, Jun Fukuyama, Daisuke Ono, and Miyu Irino). For episodes thirteen onwards, the opening theme is "Zenryoku Batankyū" (全力バタンキュー Hit the Sack At Full Force) by AouP while the ending theme is "Six Shame Faces ~~Kon'ya mo Saikō!!!!!!~ (SIX SHAME FACES 〜今夜も最高!!!!!!〜 Six Shame Faces ~Tonight is Also the Best!!!!!!~) by Totoko (Aya Endō) and the Matsuno Brothers.