While at the beach Arale Norimaki rescues a shark. In return, the shark invites her and the rest of the Norimaki to their underwater city. Meanwhile, Suppaman intends to follow them and get revenge. While in the city, Arale meets Urashima Tarō, who joins Arale while playing at the amusement park.
| Directing | Mitsuo Hashimoto | Director |
| Writing | Takao Koyama | Scenario Writer |
| Writing | Akira Toriyama | Comic Book |
| Writing | Aya Matsui | Screenplay |
| Visual Effects | Yuki Kinoshita | Key Animation |
| Visual Effects | Nobuhiro Masuda | Key Animation |
| Visual Effects | Yoshio Usuda | Key Animation |
| Visual Effects | Akio Katada | Key Animation |
| Visual Effects | Akio Ujiie | Key Animation |
| Visual Effects | Toshie Kawamura | Key Animation |
| Visual Effects | Satoru Iriyoshi | Key Animation |
| Visual Effects | Nobuyoshi Hoshikawa | Key Animation |
| Visual Effects | Mitsuru Aoyama | Key Animation |
