Direct answer
Showa 66 is the game's fictional era. A developer interview describes it as a parallel 1991 where Japan's Showa era did not end in 1989; in this timeline, Japan used its economic power to buy much of the United States and Japanese culture became deeply rooted across America.
What official sources confirm
Parallel 1991 is the older developer interview's explanation for Showa 66.
Current Steam and Gamescom promotional summaries describe the premise as taking place in the late 1980s.
The setting intentionally mixes Japanese and American pop-culture memories rather than recreating historical Showa with documentary accuracy.
How to read the available evidence
The phrase is not a claim about real history. It establishes an alternate setting where American landmarks, cities, advertising, clothing, and everyday life combine Japanese and American imagery. Current Steam and Gamescom summaries broadly say “the late 1980s,” while the older developer interview maps Showa 66 to a parallel 1991. Because those official descriptions are not identical, 1991 should be attributed to the interview rather than presented as a universal date.
The game has not launched. Trailers and developer interviews establish direction, but they do not guarantee final numbers, controls, optimal strategies, or content structure. This guide gives current NEKCOM and Steam pages priority; older announcements remain historical evidence and yield when newer first-party listings conflict.
How the sources were weighed
This page ranks evidence by how directly it supports the search question. Developer and official game pages establish the setting, platforms, and announcements. Steam establishes current PC store status and listed requirements. Community directories can show that a destination exists, but they do not replace a first-party statement.
Steam — Showa American Story: Current store record used for availability, platforms, and specifications; it is not proof of unannounced features.
NEKCOM — IGN developer interview: First-party material used for the claim it directly names; pre-release details can still change.
Gematsu — 4Divinity Gamescom 2026 overview: A dated report used for what its writer saw or recorded; preview-build observations are not final specifications.
Still pending
The finished game's exact chronology, how the late-1980s summary relates to the interview's parallel 1991, and the detailed politics behind the fictional takeover.
Pending details are not filled with guesses. They will be updated only when a traceable official source appears.