Mametchi and his friends must save Tamagotchi world from a book that is beginning to destroy reality, entitled "The World's Happiest Story".
Unfortunately the movie Tamagotchi: Happiest Story in the Universe! is not yet available on HBO Max.
| Visual Effects | Susumu Matsunaga | Key Animation |
| Visual Effects | Tomoki Ogawa | Key Animation |
| Visual Effects | Atsushi Ogata | Key Animation |
| Visual Effects | Tsuyoshi Motodate | Key Animation |
| Visual Effects | Chisato Ikehira | Key Animation |
| Visual Effects | Eikichi Takahashi | Key Animation |
| Visual Effects | Koji Fukasawa | Key Animation |
| Visual Effects | Kyoko Niimura | Key Animation |
| Visual Effects | Takashi Kojima | Key Animation |
| Visual Effects | Midori Nagaoka | Key Animation |
| Visual Effects | Tomohiro Koyama | Key Animation |
| Visual Effects | Junpei Fukuchi | Key Animation |
| Visual Effects | Akiko Nakamura | Key Animation |
| Visual Effects | Kyoko Matsubara | Key Animation |
| Visual Effects | Mizuho Tajima | Key Animation |
| Visual Effects | Yasunori Yamaguchi | Key Animation |
| Visual Effects | Kazue Tamari | Key Animation |
| Visual Effects | Yasue Ohno | Key Animation |
| Visual Effects | Yasuhiro Endou | Key Animation |
| Visual Effects | Shinichi Yoshino | Key Animation |
| Visual Effects | Tomoko Takei | Key Animation |
| Visual Effects | Junko Isaka | Key Animation |
| Visual Effects | Yuka Aono | Key Animation |
| Visual Effects | Tatsuya Annoura | Key Animation |
| Visual Effects | Mayumi Nakamura | Key Animation |
| Visual Effects | Masami Takebuchi | Key Animation |
| Visual Effects | Emiko Endo | Key Animation |
| Writing | Aya Matsui | Writer |
| Directing | Joji Shimura | Director |
