Ahead of a July 2025 broadcast, the official accounts for Mr. Osomatsu today unveiled a brand-new teaser trailer and visual for the anime’s upcoming fourth season. The latter depicts the sextuplets out and about, but their trademark laziness is on full display in the former.
Mr. Osomatsu Season 4 Teaser Trailer
Mr. Osomatsu Season 4 Teaser Visual

Yoshinori Odaka takes over as director for Mr. Osomatsu Season 4 at studio PIERROT FILMS, with Shu Matsubara and Eiji Abiko alongside as series composer and character designer, respectively. Additional staff members include:
Chief Animation Directors: Eiji Abiko, Kasumi Wada, Haru Watanabe
Assistant Director: Nene Futamura
Art Director: Seiki Tamura
Color Designer: Yukiko Kakita
Director of Photography: Toru Fukushi
Editor: Kumiko Sakamoto
Music Composer: Yukari Hashimoto
Sound Director: Hiromi Kikuta
Crunchyroll streams the first three seasons of Mr. Osomatsu and describes the story:
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: Comic Natalie