Snow Man's Koji Mukai Surprises Fans as 'Former Osomatsu' in New Osomatsu-san Movie!

On June 12, 2026, the movie Osomatsu-san: Human Trash-ification Project!!!!!? hit theaters, revealing that Snow Man's Koji Mukai makes an appearance as 'Former Osomatsu.' This unexpected casting has sparked a wave of surprise and laughter among fans and moviegoers alike.

In this film, the role of 'New Osomatsu' is played by Seiya Suezawa of Aぇ! group. The movie marks a special 'New vs. Former Osomatsu' collaboration between Suezawa and Mukai, who are of the same age and have been close friends since their days in the Kansai Junior trainee era. As the official social media accounts teased, 'The New and Former Osomatsu clash, triggering a highly volatile chemical reaction!'—and indeed, the appearance of the legendary eldest brother across space and time has garnered immense attention.

On social media, fans flooded the internet with delighted and amused comments, such as, 'What on earth is Former Osomatsu?!', 'I've never heard of such a concept before,' and 'Well, in the world of Osomatsu-san, literally anything goes!' Those who have already rushed to theaters also praised Mukai's strong screen presence, sharing, 'The moment Former Osomatsu appeared, the whole theater started whispering,' and 'He had way more screen time than I expected, and it was genuinely hilarious.'

Mukai shared his enthusiasm for the role, commenting, 'I want to hype this up as a member of Snow Man as well! Please come see it in theaters!'—showing his passionate support for his former colleagues sharing the screen. Be sure to witness this trashy yet brilliant chemical reaction woven by the old and new cast members with your own eyes.

The Context

Osomatsu-san (Mr. Osomatsu) is a wildly popular Japanese comedy franchise based on Fujio Akatsuka's classic 1960s manga Osomatsu-kun. It follows the comedic, lazy, and socially inept lives of the sextuplet Matsuno brothers as adults. The franchise is well-known for its fourth-wall-breaking humor, self-deprecating jokes, and absurd meta-narratives, making the concept of having a 'Former' and 'New' version of the same character completely on-brand.

In 2022, a highly successful live-action movie adaptation of Osomatsu-san starred all nine members of the popular J-pop group Snow Man, with Koji Mukai originally playing the eldest brother, Osomatsu Matsuno. The 2026 film introduces a new cast featuring members of another J-pop group, Aぇ! group, with Seiya Suezawa taking over the lead. Mukai's surprise reprisal of his role as the 'Former Osomatsu' not only delights fans of both idol groups but also highlights the real-life friendship between Mukai and Suezawa, who trained together for years as 'Juniors' (trainees) in the Kansai region under the same agency.

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