In the "Blood Sail Castle" of the Marauder Kingdom on the coast of the West Sea, the seventeen-year-old pirate prince Asha was sacrificed to the Storm Statue by his father during his coming-of-age ceremony. However, he unexpectedly awakened the memory of the undead plundered by his ancestors - the so-called founding myth was just a lie about the first generation of pirate kings stealing the power of the Poseidon. When he found the blood-stained "Plunderer's Navigation Chart" in the shipwreck tomb, he found that under the lighthouse in each port, there were suppressed sea princes whose keels had been stripped off. Facing the "eternal plundering array" that his father had built with the bones and blood of thousands of pirates, A'sha clenched the blood-stained rudder: he wanted the giant sail of the Blood Sail Castle to finally hoist not the plundering flag, but the blood of redemption to avenge all enslaved people.