Triton, the sole survivor of his clan annihilated by the Poseidon family 5000 years ago in Atlantis, was rescued as an infant by the dolphin Ruka. Ruka brought him to Japan's coast, where the human boy Kazuya discovered and raised him with his family. A tsunami orchestrated by Poseidon later destroyed Kazuya's village, killing his father and forcing the family to relocate to Tokyo.

As Triton matured, he displayed extraordinary aquatic abilities and rapid growth. Learning his true heritage through encounters with Ruka and other marine beings, he abandoned human society to return to the ocean, seeking vengeance against Poseidon. With dolphin companions Ruka, Uru, Karu, and Fin, he waged a one-man war across the seas.

Triton met Pipiko, the last mermaid of his clan. Their initially contentious relationship evolved into marriage. Using his Oriharcon-forged sword, Triton systematically defeated Poseidon's 33 children through strategic confrontations in oceanic regions like the Pacific and Atlantic.

The ancient sea turtle Ganomosu provided sanctuary on his shell—a floating island encircled by seven whirlpools—and later mediated a truce between Triton and Poseidon. To fulfill the truce, Triton lured a monstrous entity created by Poseidon onto dry land, where it perished under the sun.

Triton and Pipiko had seven children named after rainbow colors: Blue, Green, Indigo, Yellow, Orange, Red, and Violet Triton. When humans captured Green Triton, Triton journeyed to Tokyo for her rescue. Poseidon framed him for devastating tsunamis that struck the city, but Kazuya intervened, exposing the deception and reuniting Triton with his children.

In the final conflict, Triton entrusted leadership of the merman family to Blue Triton and allied with Ganomosu to assault Poseidon's stronghold. The battle culminated in a massive explosion that destroyed the base and claimed Triton's life. Pipiko and the children then relocated to Ganomosu Island for eternal sanctuary.