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February 17 to March 3, 1860, inside Edo castle. A group of assassins wait by Sakurada Gate to kill the lord of the House of Ii, a powerful man in the Tokugawa government, which has ruled Japan for 300 years. They suspect a traitor in their midst, and their suspicions fall on Niiro, an impoverished ronin who dreams of samurai status, and Kurihara, an aristocratic samurai who befriends Niiro. Niiro longs to identify his father, knowing he is a high-ranking official who will disclose himself only if Niiro achieves samurai status. With American ships in Japan's harbors, cynicism among the assassins, and change in the air, Niiro resolves to reach ends that may prove ephemeral.

How to Watch Samurai Assassin Legally and Safely

If you want to stream Samurai Assassin 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 Samurai Assassin 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.