The official X account of the TV anime “Osomatsu-san” (English Name: Mr. Osomatsu) revealed that this anime is renewed for the 4th season. They released an announcement trailer for this 4th season on its official YouTube channel:
It is revealed that all voice-acting casts from previous seasons will be back in the 4th season. This time, Studio Pierrot’s newly established section PIERROT FILMS is in charge of animating this 4th season.
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About Osomatsu-San
Mr. Osomatsu (Japanese Name: Osomatsu-san) is a Japanese anime television series produced by Studio Pierrot. This anime is based on the original manga by Fujio Akatsuka titled “Osomatsu-kun“. To celebrate Akatsuka-sensei’s eightieth birthday, this series is made which follows the sextuplet Matsuno brothers from the original series as adults and features more adult-oriented humor compared to the original series.
This series has 3 seasons, 3 movies, and a spin-off titled “Matsu Inu.”
Crunchyroll licensed this series outside of Japan and explains this anime as:
“Mr. Osomatsu is based off of the gag manga series Osomatsu-kun by Fujio Akatsuka, and ran from 1962 to 1969. The series features a set of sextuplets, the Matsuno brothers, with Osomatsu being the oldest brother and leader of the group.“
Source: Official Website