In his quest for immortality, the emperor led a fleet to the South Seas in search of the Buddha Island, only to suddenly pass away. Crown Prince Jianwen was falsely accused of regicide and began his life of escape on the vast seas. Meanwhile, various factions within the court were stirring, 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 teams up with a Japanese ninja girl, a descendant of the Mongol navy, and a Western naturalist, and together they embark on a legendary maritime adventure to uncover the secrets of the Buddha Island.