At the cost of a huge sacrifice, Hyôga managed to defeat his childhood friend. Isaac's death allowed us to break a new ocean pillar, but it was the heavy heart that Hyôga joined his companions. Shun now had to face the dreadful Sorente de la Siren Maléfic and his hypnotic melodies... Shun's heavy past was in turn revealed, and the secret of his terrible training would again throw a veil of tragedy on the duel of Andromeda. Sent by the Sanctuary in order to lend a strong hand to the Knights of Bronze, Shina managed to reach the temple of the underwater city of Poseidon, wishing to end the god once and for all. But on the spot, a horrible surprise awaits him...