Taken in as a baby by the human boy, Kazuya, Triton is raised on land and gets to know human society. However, Triton decides to return to the sea with his dolphin friends in order to get revenge on the Poseidon family for killing all the mermen and mermaids of his family.

5000 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.<br>
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(Source: Anime News Network)

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The ocean holds many tales. Tales of mermaids, of underwater kingdoms, and of fantastical beasts lurking in the deep. Spurred by these tales, Kazuya sets out to find the truth, but what he finds is a baby?! Not just any baby, the baby Kazuya finds is Triton! The last of a once mighty and proud race of people from the sea. Triton seems human, but unusual and terrible events begin to happen with all those around him. Who is Triton, and why does he bring misfortune to everyone around him? <br><br>
(Source: DMP)