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: A high-quality interactive feature created in collaboration with the manga's authors to explain the historical reality of the opium trade and the "Satomi Agency" (the model for the series' criminal organizations). Manchuria Opium Squad - Wikipédia

In Chapter 86, the narrative focuses on the dangerous intersection of criminal organizations and military oversight in Manchuria. Historically, this reflects the "chaos" of the era where the Kwantung Army used opium profits to fund their operations and the puppet state of Manchukuo. Recommended Academic Papers and Research

If you are looking for formal papers or authoritative historical context related to the events depicted in the series: