In the early 16th century, Japan is a warlike society ruled by samurai and their daimyo warlords. When Portuguese merchants arrive in 1543, they are the first Europeans to set foot in Japan. Missionaries quickly set out to convert the nation to Christianity. In the same year, a samurai boy named Tokugawa Ieyasu is born to a low ranking daimyo family. To prove his family's loyalty to their ruling warlord, Ieyasu is given as a hostage where he remains for most of his childhood.