No. The trilogy contains graphic depictions of war, genocide, drug use, and atrocities based on real historical events including the Nanjing Massacre. These elements are central to the work's purpose. Content warnings apply strongly.
Yes — the trilogy draws heavily on 20th-century Chinese history. The Second Sino-Japanese War and the Nanjing Massacre are direct inspirations. Kuang, a historian, uses fantasy as a lens to examine these events and their moral weight.
No — Babel (2022) is a completely separate standalone novel set in 1830s Oxford. The Poppy War trilogy and Babel share an author but no world or characters.