So this is Demon slayer but during Akazas (/Hakuji Soyama, as Akazas real name) Time period! So yes the Edo period (1603–1867), a time of strict social hierarchy and isolated peace under the Tokugawa Shogunate. Based on his backstory, his life likely took place in the 18th century (the 1700s), as indicated by the popularity of fireworks during his human years and the specific criminal branding system used at the time. Life in the Edo Period The era was defined by the "Pax Tokugawa," a 250-year p