The story takes place in 1633 in the city of Wanguo. It follows Chang Feng, a young woman who joins the mysterious "Tian Gong" organization to fight against Spanish settlers and other foreigners.

1663 Common Era, the youngest leader of the Ming dynasty's navy Lu Changfeng is to escort an official to capture criminals but was attacked by a ghost fleet and sea beasts, causing the entire envoy to be sunk. Lu Changfeng was saved by a mysterious girl from the ocean bottom and followed her to the international center of commerce of the Age of Sail: Luzon.

"1663 Common Era, the youngest leader of the Ming dynasty's navy Lu Changfeng is to escort an official to capture criminals but was attacked by a ghost fleet and sea beasts, causing the entire envoy to be sunk. Lu Changfeng was saved by a mysterious girl from the ocean bottom and followed her to the international center of commerce of the Age of Sail: Luzon. At the time, over 70% of the Ming dynasty's silver was obtained from Luzon, and this tiny island determined the fate of several nations. Spanish settlers cruelly ruled, and people of all walks of life, under the guidance of Song Yingxing, constructed the international finance center: the Kingdom of Wan. Despite disagreements with Song Yingxing, Lu Changfeng still chose to join Song's team: Tian Gong, participating in the struggle against Spanish settlers with others. Both factions used bleeding-edge technological inventions in their battle. To resist the enemy genius Vesalius's weapon, Song Yingxing manipulates Lu Changfeng, bringing out his days fighting Vesalius in Korea, etc."—Bilibili TV

Human beings were exploring the world during the great sailing era centuries ago. At the time, officer Lu from the navy was on his way to the "Wan Guo" city to arrest a wanted criminal. He applied advanced technology beyond the time to fight the invasion forces, faced up to humankind's greed, and opened the gate for a new world.—Anime Made By Bilibili - Official YouTube Channel