Heart is a tyrannosaurus who is found and raised bv a herbivore mother. After learning his true nature as a meat eater, he runs away from home and finds a baby ankylosaurus egg that hatches and thinks Heart is his father. After accidentally naming the baby Yummie - thinking he looked tasty - their love for one another tests the bounds of nature vs. nurture.
| Directing | Masaya Fujimori | Director |
| Writing | Osamu Murakami | Screenplay |
| Writing | Hiroaki Jinno | Screenplay |
| Art | Takashi Nakamura | Art Direction |
| Visual Effects | Yoshiaki Yanagida | Character Designer |
| Art | Masaya Fujimori | Storyboard Designer |
| Visual Effects | Yoshiaki Yanagida | Animation Director |
| Sound | Toshihiko Nakajima | Sound Director |
| Sound | Shizuo Kurahashi | Sound Effects |
| Visual Effects | Eriko Murata | Color Designer |
| Editing | Yuriko Sano | Editor |
| Writing | Tatsuya Miyanishi | Book |
| Sound | Masafumi Mima | Sound Director |
| Camera | Akio Saitou | Director of Photography |
| Sound | Tamiya Terashima | Original Music Composer |
| Visual Effects | Takafumi Hori | Key Animation |
| Visual Effects | Reiko Nozaki | Key Animation |
| Visual Effects | Koichiro Kawano | Key Animation |
| Visual Effects | Aki Kuki | Key Animation |
| Visual Effects | Atsuko Nozaki | Key Animation |
| Visual Effects | Noriko Ozeki | Key Animation |
| Visual Effects | Yoko Ono | Key Animation |
| Visual Effects | Yoko Suzuki | Key Animation |
| Visual Effects | Mamoru Otake | Key Animation |
| Visual Effects | Kyoko Kametani | Key Animation |
| Visual Effects | Ichirou Ogawa | Key Animation |
| Visual Effects | Hiroki Harada | Key Animation |
| Visual Effects | Akiko Taniguchi | Key Animation |
| Visual Effects | Ami Nagata | Key Animation |
| Visual Effects | Atsuya Miura | Key Animation |
| Visual Effects | Haruo Miyagawa | Key Animation |
| Visual Effects | Hatsue Nakayama | Key Animation |
