Details have been announced for a special event to be held on June 6th to commemorate the 10th anniversary of the popular anime "Mr. Osomatsu." Titled "10th ANNIVERSARY OSOMATSUSAN SPECIAL 6DAYS Opening Festival," the event will feature the voice actors for the Osomatsu brothers: Takahiro Sakurai ), Yuichi Nakamura ( Karamatsu ), Hiroshi Kamiya (Choromatsu ), Ichimatsu Jun Fukuyama(Jyushimatsu), Daisuke Ono Ono (Todomatsu ), and Aya Endo Miyu Irino (Todomatsu), as well as other voice actors such as Aya Endo (Totoko), Yuki Kokuryu (Chibita), Yoji Ueda (Dekapan), Nobuo Tobita (Dayoon), and Momoko Saito (Hatabou). The voice actors will be divided into an "older brother team" and a "younger brother team," and will appear in a total of six performances held at three venues: Shinjuku Piccadilly (Shinjuku Ward, Tokyo), Marunouchi Piccadilly (Chiyoda Ward, Tokyo), and Kawasaki Cinecitta (Kawasaki Ward, Kawasaki City).
The event will feature a special screening of episode 13 (the final episode) of season 4, which has never been aired before. In addition, episode 3, "Thunderstorm and Crew Cut," which was voted the number one "favorite episode of season 4" in a "Matsumoto General Meeting Survey" conducted by fans and staff, will also be screened.
It was also announced that a limited-time screening of episode 13 (the final episode) of the fourth season, episode 3 "Thunderstorm and Crew Cut," will be held at movie theaters nationwide for six days starting June 6th as part of the "10th ANNIVERSARY OSOMATSUSAN SPECIAL 6DAYS" event. Details of the admission特典 (special gifts for attendees) will be announced at a later date.
" Mr. Osomatsu san" is based on Fujio Akatsuka's gag manga "Osomatsu kun." It depicts the daily lives of the six brothers as adults, and its outrageous gags have made it popular, especially among female anime fans.
The first season of the TV anime aired from October 2015 to March 2016, the second season from October 2017 to March 2018, the third season from October 2020 to March 2021, and the fourth season from July to September 2025. The theatrical film "Osomatsu San Movie" was released in March 2019. To commemorate the 6th anniversary, the first new anime film, "Mr. Osomatsu-san: The Hippo Tribe and the Shining Fruit," was screened in theaters in July 2022, and the second, "Mr. Osomatsu-san: The Soulful Takoyaki Party and the Legendary Sleepover," was screened in theaters in July 2023.

