Over many years, the animals evolved in isolated cities, with artificial genetic crossbreeding, they acquire language, bipedality, and build a life and civilization for themselves free from want. No one thinks of the world below any longer. One day, a single plant seed wanders into one of the sky cities, and the children Kui, Hiruma, and Root discover it. Unable to resist the temptation to look into the world outside, they decide to undertake an adventure to the outside world, unknowing that once they set foot on the ground, they will never be able to return.
| Directing | Takahiro Tanaka | Director |
| Visual Effects | Yoshiko Arahata | Key Animation |
| Visual Effects | Takahiro Tanaka | Character Designer |
| Visual Effects | Sanae Shimada | Character Designer |
| Visual Effects | Sanae Shimada | Animation Director |
| Visual Effects | Akiko Saito | CGI Director |
| Art | Osamu Hasada | Art Direction |
| Visual Effects | Kumiko Naruke | Color Designer |
| Editing | Rie Matsubara | Editor |
| Sound | Koji Kasamatsu | Sound Designer |
| Sound | teng | Original Music Composer |
| Visual Effects | Yasuyuki Shimizu | Key Animation |
| Visual Effects | Rie Nishino | Key Animation |
| Visual Effects | Manamu Amasaki | Key Animation |
| Visual Effects | Wakana Yamashina | Key Animation |
| Visual Effects | Satsuki Tamura | Key Animation |
| Visual Effects | Sae Ozawa | Key Animation |
| Visual Effects | Kanako Takeuchi | Key Animation |
| Visual Effects | Yuki Takahashi | Key Animation |
| Production | Tomoko Ogiwara | Producer |
