Gora, captain of the new Hién mercenary ship, Sea Guardian, embarks on a perilous quest to dismantle the heinous pirate circle responsible for abducting and slaying innocent children across the globe. But his pursuit uncovers a chilling revelation—the circle's sinister leader, a formidable seer and pirate queen, commands a vast fleet of ships united by a mysterious and ominous mission that could reshape the world.

Yoshiko, now the daimyō of Hié, grapples with the daunting task of rebuilding her realm. But reports emerge of magical creatures, thought long extinct, resurfacing and endangering her people. Determined to unearth the connection between her heritage and the return of these mysterious beings, Yoshiko stumbles upon a horrifying truth—her abilities will haunt her even in death.

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Forced to confront their pasts and those seeking their destruction, Gora and Yoshiko are thrust into a battle of friendship, sacrifice, courage, and survival. As the line between right and wrong blurs and morals clash, they must navigate a treacherous world where the price of victory may be more than they are willing to pay.