The Ninjas Didn't Exist
Nightshift – Kurzgesagt After Dark · 2026-05-13 · 16 min
https://www.youtube.com/watch?v=bVc_xY6TWiYVideo summary
Iga’s shinobi began as spies and castle detectives; postwar films later invented the familiar black-clad ninja.
The video separates the legendary ninja from the historical shinobi. During Japan’s civil wars, Iga and Kōka samurai used espionage, disguises and ambushes; Oda Nobunaga’s 1581 invasion crushed Iga, but its fighters later helped Tokugawa Ieyasu escape and rise to power. Under the Tokugawa Shogunate, their descendants served as castle detectives, gathering intelligence and uncovering an alleged 1651 plot to burn Edo and seize the castle. As Japan opened to foreign powers in 1854, spies such as Sawamura Yasusuke could not halt the Shogunate’s decline, and the Meiji reforms replaced its institutions. The historical shinobi disappeared, while kabuki, prints and modern entertainment built the myth: the straight ninja sword appeared in a 1956 tourism ad, throwing stars in a 1957 film, and ninjutsu as a martial art was largely a postwar creation.
Chapters
- 0:00Start: The 1580 Azuchi Castle Assassin Is a Ninja Legend
- 1:12A Shattered Empire: Oda Nobunaga Crushes Iga with 40,000 Samurai
- 4:16History on a Knife Edge: Hattori Hanzo Helps Tokugawa Ieyasu Escape Iga
- 6:48Sniffing Out Conspiracy: Marubashi Chūya's Edo Plot and the Rise of the Ninja Legend
- 10:46The World Comes to Japan: Perry's 1854 Gunboats and Sawamura Yasusuke's Spy Mission
- 13:06Enter the Ninja: Fujita Seiko's 1936 Claims and the Postwar Ninja Myth
What the full analysis includes
6 chapters · 28 key points · 6 section summaries · mind map
Preview of the first chapter · Start: The 1580 Azuchi Castle Assassin Is a Ninja Legend
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