At the time between the World Wars, Japan is involved in empire-building throughout East and Southeast Asia. After a brief career as a low-level military adventurer, Iheiji sets up chains of brothels throughout Asia. As Japan's power in the region grows, so does Iheiji's prosperity and patriotism.

As battle rages in Shanghai, a single battalion of soldiers led by Xie Jinyuan is ordered to hold back the Japanese forces at the Sihang warehouse. Girl scouts risk their lives to deliver food and medicine to the defenders.