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Following the detonation of the atomic bombs on Hiroshima and Nagasaki, the Japanese military and the government clash over the demand from the Allies for unconditional surrender. Minister of the Army Anami leads the military officers who propose to fight on, even to the death of every Japanese citizen. Emperor Hirohito, however, joins with his ministers in asking the unthinkable, the peaceful surrender of Japan. When the military plots a coup to overthrow the Emperor’s civilian government, Anami must face the choice between his desires and loyalty to his Emperor.

How to Watch Japan's Longest Day Legally and Safely

If you want to stream Japan's Longest Day through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Japan's Longest Day films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.