Based on the novel Tottòi by Gianni Padoan. Sardinia is abundant in beautiful beaches and mysterious caves which are known as the habitat of a peculiar kind of seal on the verge of extinction. After moving to this island, Tottoi, fascinated by nature, visits different beaches and caves everyday. When he finds a seal cub and its mother in an isolated cave, he is surprised by the humorous movements and innocence of the cub and the dignity of its mother. Tottoi soon becomes attached to the seals, but his secret is revealed to heartless adults. In the name of preservation, a plan is developed to capture them for an aquarium. Now the dignity and pride of the wild seal are in danger. No matter how painful for Tottoi to be separated from his small friends, he must fight for the welfare of the wild mammals and let them go free into the sea.
| Directing | Norifumi Kiyozumi | Director |
| Writing | Gianni Padoan | Original Story |
| Camera | Toshiaki Morita | Director of Photography |
| Sound | Koichi Sakata | Music |
| Visual Effects | Haruhiko Mikimoto | Character Designer |
| Writing | Ryuzo Nakanishi | Screenplay |
| Editing | Osamu Suda | Editor |
| Visual Effects | Noboru Ishiguro | Animation Supervisor |
| Editing | Yuko Watase | Editor |
| Visual Effects | Fujiko Aoyagi | Animation |
| Visual Effects | Shinichi Toda | Animation |
| Art | Takashi Moro | Art Direction |
| Production | Kazushi Nishio | Producer |
| Production | Junzō Nakajima | Producer |
| Visual Effects | Masao Nakata | Animation |
| Visual Effects | Kenichi Imaizumi | Animation |
| Visual Effects | Shûichi Ishii | Animation |
| Visual Effects | Shinichiro Nishijima | Animation |
| Visual Effects | Kenji Yokoyama | Animation |
| Visual Effects | Kôichirô Saotome | Animation |
