Mr. Osomatsu

Mr. Osomatsu (Japanese: おそ松さん, Hepburn: Osomatsu-san) is a Japanese adult comedy anime produced by Studio Pierrot, based on Fujio Akatsuka's 1962 manga series, Osomatsu-kun. Celebrating Akatsuka's eightieth birthday, the series follows the sextuplet Matsuno brothers from the original series as 20-something adults, with a more ribald sense of humor compared to Osomatsu-kun. The first season aired in Japan between October 2015 and March 2016, with a special episode airing in December 2016. A second season aired between October 2017 and March 2018, followed by a third season from October 2020 to March 2021. A fourth season aired from July to October 2025, with an extended delay on the final episode, which premiered in June 2026. The first two seasons have been licensed in the Americas by Viz Media. A manga adaptation by Masako Shitaro was serialized in Shueisha's You magazine from January 2016 to October 2018. It was then transferred to Shueisha's Cookie magazine, where it continued serialization from November 2018 to November 2020. Three theatrical anime films based on the series premiered in March 2019, July 2022, and July 2023. A spin-off short anime series titled Matsu Inu, involving alternate versions of the sextuplets as dogs, aired from October to December 2023.