The sextuplets attend a high school class reunion. There, they see all their former classmates who have become "proper" adults with company jobs. The sextuplets sulk about this and go home and drink until they fall asleep. But when they wake up, a certain scene awaits them.
You can now watch Mr. Osomatsu the Movie online on the following streaming providers in the United States.
| Directing | Youichi Fujita | Director |
| Visual Effects | Naoyuki Asano | Character Designer |
| Sound | Dream Ami | Theme Song Performance |
| Writing | Shu Matsubara | Screenplay |
| Visual Effects | Ai Mochida | Key Animation |
| Visual Effects | Naoyuki Asano | Key Animation |
| Visual Effects | Tamako Horiuchi | Key Animation |
| Visual Effects | Yoshihiro Kanno | Key Animation |
| Visual Effects | Ranko Nakabayashi | Key Animation |
| Visual Effects | Rinako Nishihara | Key Animation |
| Visual Effects | Haru Watanabe | Key Animation |
| Visual Effects | Atsuki Shimizu | Key Animation |
| Visual Effects | Chiharu Kataoka | Key Animation |
| Visual Effects | Maki Kouno | Key Animation |
| Visual Effects | Saeko Ozawa | Key Animation |
| Visual Effects | Yoshiko Shimizu | Key Animation |
| Visual Effects | Tomomi Shimazaki | Key Animation |
| Visual Effects | Junko Nakamura | Key Animation |
| Visual Effects | Kasumi Wada | Key Animation |
| Visual Effects | Haruka Matsunae | Key Animation |
| Visual Effects | Fumiyo Kimura | Key Animation |
| Visual Effects | Fumio Matsumoto | Key Animation |
| Visual Effects | Aya Nakanishi | Key Animation |
| Writing | Fujio Akatsuka | Original Series Creator |
| Visual Effects | Masahiro Tomaru | Key Animation |
| Visual Effects | Keiichiro Matsui | Key Animation |
| Visual Effects | Yoshimi Miki | Key Animation |
| Visual Effects | Yui Soeda | Key Animation |
| Visual Effects | Yuri Masuda | Key Animation |
| Visual Effects | Yuta Yokoo | Key Animation |
| Visual Effects | Yasunari Nitta | Key Animation |
| Visual Effects | Yasuko Miyazaki | Key Animation |
| Visual Effects | Yoshihiro Owada | Key Animation |
| Visual Effects | Han Seung-ah | Key Animation |
| Visual Effects | Miyachi | Key Animation |
| Directing | Takumi Doyama | Second Unit Director |
| Art | Takumi Doyama | Storyboard Artist |
