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In ancient times, on the eve of the Twilight of the Gods, Odin, the king of the gods, knowing that his defeat was certain, sealed most of his power in the farthest reaches of the world, and left a mysterious coordinate called the "Odin Sea". He hoped that the surviving descendants could find this supreme power after the war and lead the gods to rejuvenation. However, the eternal spear [Gangnir], which was the key to opening the door to the Odin Sea, was lost when Odin died tragically on the battlefield. The surviving black dragon [Nidhogg] gave birth to a blood descendant named [Calleto]. Because he inherited the inherent greed and cruelty of the black dragon, [Calleto] launched a thousand-year bloody war called [Second Twilight] against all creatures that survived the catastrophe. As time went by, the secrets of the Odin Sea were lost. Now, because of being involved in a sudden storm, the fate of college student Nan Yan is closely linked to the Odin Sea...