This film offers an in‑depth look at Tokugawa Iemitsu, the grandson of Tokugawa Ieyasu, who established the Tokugawa shogunate and ended the Sengoku period with decisive victories. Iemitsu is chiefly remembered for his xenophobic stance and his efforts to isolate Japan, a policy known as Sakoku. The isolationist measures he enacted kept Japan closed off for nearly two centuries, ultimately leading to internal unrest and conflict during the Meiji era when the nation reopened its borders and discovered it lagged behind the rest of the world in economic, political, industrial, scientific, and cultural development.