Mr. Osomatsu Season 4: Exciting Promo Unveils Theme Songs and July 8 Premiere
Discover how Hitomi of Atarayo teams up with the Osomatsu sextuplets for a unique and lively anime ending theme!

Mr. Osomatsu Season 4 Premieres July 8: New Theme Songs and Cast Revealed
Hitomi of Atarayo and the iconic Osomatsu sextuplets will perform the ending theme song for the upcoming fourth season of the Mr. Osomatsu anime. The highly anticipated season is set to premiere on television on July 8, 2024.
Key Announcements
- Premiere Date: July 8, 2024 (12:00 a.m. JST, effectively July 9)
- Broadcast Channels: TV Tokyo, TV Osaka, TV Aichi, TV Setouchi, TV Hokkaido, and TVQ Kyushu
- Ending Theme Song: "Buddy" by Hitomi (Atarayo) and the Osomatsu sextuplets
- Opening Theme Song: "Oso*matsu-san no Bomba Sheeh!" by DA PUMP
- Promotional Visuals and Video: Released alongside the announcement
Watch the Official Promo
New Visuals
Image via Mr. Osomatsu anime's website
Image via Mr. Osomatsu anime's website
Theme Songs and Production Crew
- The opening theme is a Japanese cover of an overseas song (title still undisclosed). The Japanese lyrics are by rapper m.c.A・T.
- Seiji Kameda composed, arranged, and wrote the lyrics for the ending theme.
Main cast and staff:
- Osomatsu Sextuplets Voice Actors:
- Takahiro Sakurai
- Yūichi Nakamura
- Hiroshi Kamiya
- Jun Fukuyama
- Daisuke Ono
- Miyu Irino
- Director: Yoshinori Odaka (returning from previous seasons and movies)
- Series Scripts: Shū Matsubara
- Character Designer: Eiji Abiko
- Animation Studio: Pierrot Films
About Mr. Osomatsu
Mr. Osomatsu is inspired by Fujio Akatsuka's original Osomatsu-kun manga and its "high tension comedy" anime. The story follows the mischievous Matsuno sextuplets, now reimagined as adults, as they get into all sorts of trouble. In the original series, the brothers were 10 years old; the modern adaptation shows their antics as adults, all vying for the attention of the same girl, Totoko.
Franchise History
- Anime Seasons:
- Season 1: 2015
- Season 2: 2017
- Season 3: 2020
- Films:
- Eiga no Osomatsu-san (2019)
- Osomatsu-san
Hipipo-Zoku to Kagayaku Kajitsu(2022) - Osomatsu-san: Tamashii no Takoyaki Party to Densetsu no Otomari-kai (2023)
- Spin-offs:
- Various anime shorts
- Live-action movie
- "Matsuinu" dog character product line and corresponding anime shorts (2023)
- Exclusive 4-episode "ultra-short anime" for fan club members (2023)
Looking Ahead
Fans can expect the Osomatsu brothers’ usual blend of slapstick comedy and heart as Season 4 returns with familiar voices and exciting new music collaborations. The franchise continues to expand with new projects, films, and creative ventures.
Sources: Mr. Osomatsu anime's website, Comic Natalie