In his pursuit of immortality, the emperor commanded a fleet to the South Seas to find Buddha Island, only to die suddenly. Crown Prince Jianwen was wrongly accused of regicide and began a life of flight across the vast oceans. Meanwhile, various court factions were agitating, and an unknown evil force infiltrated and disrupted the proceedings. How will Crown Prince Jianwen uncover the truth amidst these conspiracies? During his escape, he joins forces with a Japanese ninja girl, a descendant of the Mongol navy, and a Western naturalist, and together they set out on a legendary maritime adventure to reveal the secrets of Buddha Island.