5,000 years ago, the Triton Family was living peacefully in Atlantis until the Poseidon Family destroyed them all. Triton, of the Triton Family line, embarks on an adventurous life in the sea fighting the Poseidon Family.
| Actor | Role |
|---|---|
 Yoku ShioyaTriton (voice) | Triton (voice) |
| AAkemi HirokawaPipi (voice) | Pipi (voice) |
 Haruko KitahamaRuka (voice) | Ruka (voice) |
 Kazuko SugiyamaFin (voice) | Fin (voice) |
 Keiichi NodaTriton's Father (voice) | Triton's Father (voice) |
 Yonehiko KitagawaGod of Poseidon (voice) | God of Poseidon (voice) |
 Toshiko SawadaTriton's Mother (voice) | Triton's Mother (voice) |
| RRyusuke ShiomiMedon (voice) | Medon (voice) |