Showa Era refers to the era when Suzuno Osugi was inside The Universe of the Four Gods, following the Taisho Era. The era's end also marks the summoning of the beast god Byakko along with the tragedic separation of Suzuno and Tatara.
The Showa Era coincides with the reign of Emperor Showa, known to Westerners as Emperor Hirohito, who was in the throne from December 1926 to January 1989. Socially and politically speaking, the Showa Era is marked first by the Japanese Empire's iron-fisted colonialism and expansion through Asia and its extremely conflicted role in World War Two, and from 1945 on by the rebuilding of the country after both the atomic bombings and the American occupation.