by The 10th-anniversary celebration of the TV anime Osomatsu-san is heading toward its grand finale with a collaboration fans of Japanese gag anime are unlikely to forget. The final collaboration project has been confirmed as a crossover with Gintama, another hugely popular comedy series known for its irreverent humor, eccentric characters,s and parody-driven storytelling.
Along with the announcement, a brand-new collaboration visual featuring characters from both anime series has been unveiled. The crossover brings together the Matsuno brothers and members of the Gintama cast in a visual that immediately highlights the chaotic comedy and distinctive personalities shared by both franchises.
Original merchandise based on the newly released artwork is also planned, although additional details about the products and release schedule will be announced later.
Osomatsu-san Celebrates 10 Years
The TV anime Osomatsu-san officially celebrated its 10th anniversary on October 6, 2025.
The series is a modern reinterpretation of Fujio Akatsuka’s classic gag manga Osomatsu-kun. While the original story focused on the six Matsuno brothers as children, Osomatsu-san reimagines them as adults who have failed to become responsible members of society.
Osomatsu, Karamatsu, Choromatsu, Ichimatsu, Jyushimatsu and Todomatsu are all portrayed as NEETs with very different personalities, but they share one major trait: none of them seems particularly interested in becoming a conventional adult.
Their everyday lives frequently descend into absurd situations, allowing the anime to combine character comedy, parody and unpredictable jokes.
The first season of Osomatsu-san aired from 2015 to 2016, followed by Season 2 from 2017 to 2018 and Season 3 from 2020 to 2021. The fourth season aired in 2025, adding another chapter to the long-running franchise.
The 10th-anniversary celebration has included several special projects and collaborations designed to revisit the series’ history while introducing it to newer fans.
Gintama Becomes the Final 10th-Anniversary Collaboration.
For the final collaboration of the 10th-anniversary project, Osomatsu-san is joining forces with Gintama.
Based on Hideaki Sorachi’s manga, Gintama originally ran in Weekly Shonen Jump, published by Shueisha. The series became famous for combining science fiction, samurai action, slapstick comedy,y and parody while frequently breaking the fourth wall.
The manga has reportedly surpassed 73 million copies in worldwide circulation, including digital editions.
Although Osomatsu-san and Gintama have different settings, the two series share a very important quality: comedy is at the center of their identities.
Both franchises are also known for taking familiar anime and manga conventions and turning them upside down. That makes Gintama a particularly fitting choice for the final Osomatsu-san anniversary collaboration.
The New Collaboration Visual Is Full of Character
The newly released visual immediately shows why the crossover works so well.
At the center, Osomatsu and Sakata Gintoki appear side by side, casually enjoying drinks. The pairing captures the personalities of both characters, with Osomatsu’s laid-back attitude matching Gintoki’s famously relaxed approach to life.
The visual also features Ichimatsu and Okita Sougo standing together while holding bazookas.
That pairing is another clever choice. Both characters have distinctive personalities and a tendency to create chaos, making their combination particularly appropriate for a crossover between two gag anime.
Rather than simply placing characters from the two franchises together, the artwork appears designed to emphasize similarities and contrasts between them.
It is exactly the kind of playful crossover that fans of both series would expect.
Why Osomatsu-san × Gintama Makes Sense
At first glance, Osomatsu-san and Gintama may appear to belong to completely different worlds.
Gintama is set in an alternate version of historical Japan where aliens have invaded Edo, while Osomatsu-san focuses on the everyday lives of six unemployed brothers.
However, both series have built their popularity around fast-paced comedy, parody,dy and memorable character interactions.
They are also anime that do not always take themselves seriously. One moment can involve a completely ordinary conversation, while the next can turn into an absurd action sequence.
That shared comedic DNA makes the crossover feel natural.
For longtime viewers, the collaboration also provides an opportunity to imagine how the characters would interact if they actually shared the same world.
A Series of 10th-Anniversary Collaborations
The Gintama crossover is not the first collaboration announced as part of Osomatsu-san’s 10th-anniversary celebrations.
Previous projects included collaborations with Welcome to Demon School! Iruma-kun and Sgt. Frog the Movie: Revival and Immediate Crisis of Earth’s Destruction!.
The Iruma-kun collaboration was announced on March 31, while the Sgt. Frog collaboration was announced on May 1.
The addition of Gintama now brings the anniversary collaboration project to its final major crossover.
Each collaboration has allowed Osomatsu-san to interact with another established anime franchise, creating new character combinations and special artwork for fans.
New Osomatsu-san × Gintama Merchandise Is Coming.
Fans will not have to settle for the collaboration visual alone.
Original merchandise featuring the newly released crossover artwork is planned, allowing fans to collect goods based on the special anniversary project.
At present, the exact merchandise lineup, prices, release date, and purchasing information have not been fully revealed.
More information is expected to be announced at a later date.
Because this is being positioned as the final collaboration project of the Osomatsu-san 10th-anniversary celebration, the merchandise could become particularly appealing to longtime collectors and fans of both anime.
What Makes Osomatsu-san So Popular?
For viewers unfamiliar with the franchise, Osomatsu-san is essentially a comedy about six brothers who have very little interest in becoming productive adults.
Each brother has a distinct personality:
Osomatsu – The eldest brother and a carefree troublemaker.
Karamatsu – A self-proclaimed cool guy who often embarrasses himself.
Choromatsu – More serious and responsible than his brothers, although he has his own quirks.
Ichimatsu – A quiet and withdrawn character with a love of cats.
Jyushimatsu – Extremely energetic and unpredictable.
Todomatsu – The youngest brother, who is often more socially aware than the others.
Their contrasting personalities are one of the major reasons the series can generate so many different comedic situations.
The anime also frequently parodies other popular works and aspects of Japanese pop culture, making it particularly appealing to viewers who enjoy comedy that references the wider anime industry.
A Fitting Finale for the 10th Anniversary
The Osomatsu-san 10th-anniversary project has celebrated a decade of the modern anime adaptation, and ending the collaboration series with Gintama is a fitting choice.
Both franchises have developed strong reputations for unpredictable humor, parody,y and characters who can turn an ordinary situation into complete chaos.
The new visual featuring Osomatsu and Gintoki, along with Ichimatsu and Okita, already gives fans an idea of the comedic possibilities.
While the exact details of the upcoming merchandise and any additional crossover content remain under wraps, more information is expected in the future.
For fans of Osomatsu-san, Gintama, or Japanese gag anime in general, this collaboration is one anniversary project worth watching.
