To mark the launch of Mr. Osomatsu Season 4, the special event Are You Ready to Have Fun? Welcome Party with the Sextuplets and Totoko!! was held on June 6 at Westa Kawagoe in Saitama, Japan. It was the first time since Season 2 that the full main voice cast gathered for a public event.

On stage were Takahiro Sakurai, Yuichi Nakamura, Hiroshi Kamiya, Jun Fukuyama, Daisuke Ono, Miyu Irino, and Aya Endo. As fans cheered loudly, the event kicked off with a series of jokes and nostalgic catchphrases—true to the chaotic spirit of Mr. Osomatsu.

Sakurai joked, “The cheering is so loud, I forgot how popular this series is.” Nakamura fired back, “Don’t get carried away.” Ono got the crowd shouting with Jyushimatsu’s famous chant: “Hustle hustle! Muscle muscle!” only to be teased by Irino: “Didn’t we ban that? Weren’t you supposed to pay ¥10,000 if you did it?” to which Ono surrendered, “I’ll pay!”

Endo, in her role as Totoko, flubbed her intro—“I’m Totto–Totoko…”—sparking laughter and setting the tone for a wild, unscripted celebration.

Stage Play Revival Announced and Hopes for Future Seasons

Alongside discussions about Season 4’s highlights and music, the cast performed a surprise live voice-over session. Additionally, the event revealed the return of the stage play Mr. Osomatsu on STAGE: SIX MEN’S SHOW TIME – 2nd SEASON, and its cast also appeared on stage.

Irino, who voices Osomatsu, noted how tough shouting all the time has become but added, “We’ve been doing this for 10 years and it’s still fun. If there’s a Season 5, 6... even 16, I’ll be happy—as long as there’s less shouting.” Kamiya quipped, “By Season 16, someone here will be hitting 70.”

Ono, ever the joker, was interrupted by a mascot behind him and shouted, “Hey! I’m talking here!” before delivering his catchphrase “Thanks-a-million Sayonara Home Run!” and earning another scolding from Irino: “You weren’t supposed to say that either!”

Fukuyama shared a YouTube tidbit from director Matsubara and Sakurai, saying “Apparently, I’m totally jacked. Please watch me with shredded eyes.” Kamiya added, “Nothing sticks with me anymore. Choromatsu’s stories are always exhausting—right? I don’t even remember them.”

Nakamura reflected, “Ten years ago, after our first session, I hoped this would become a lifelong role. And here we are—tired, but proud.”

Sakurai closed the event by saying, “The series has grown, and maybe we've forgotten a few things or felt drained, but that's because we gave it everything. Here's to hoping we make it to Season 6... or even 10.”

10 Years of Irreverent Comedy

Based on Fujio Akatsuka’s classic Osomatsu-kun, the anime Mr. Osomatsu reimagines the beloved sextuplets as hopeless NEET adults. Since Season 1 aired from 2015–2016, it has spawned multiple seasons, theatrical films, and stage plays.

Season 4 officially begins July 8, airing every Tuesday at 24:00 (midnight) on six TV Tokyo-affiliated stations. The MC for the event was comedian Motohiro Takewaka from Buffalo Goro.

FAQ

When does Mr. Osomatsu Season 4 start airing?
It begins July 8, 2025, airing every Tuesday at 24:00 on TV Tokyo’s network.

Who attended the Welcome Party?
All six main voice actors (Takahiro Sakurai, Yuichi Nakamura, Hiroshi Kamiya, Jun Fukuyama, Daisuke Ono, Miyu Irino) and Aya Endo (Totoko).

What was announced during the event?
The revival of Mr. Osomatsu on STAGE – 2nd SEASON and a live dubbing session. The event also celebrated the show’s 10th anniversary.

Is Season 5 confirmed?
Not officially, but the cast expressed hopes to continue the series.

Mr.Osomatsu Season 4 Trailer

Source : ORICON NEWS