During a civil war in 17th century Japan, a nearly defeated Shogun sends his son, Lord Mayeda, to Spain to buy guns from King Phillip III. Along the way he must fight shipboard spies and fierce storms, and once Mayeda arrives in Spain, he is confronted by the evil Duke Don Pedro. In defeating Don Pedro, Mayeda saves King Phillip, gets his guns, and wins the love of Lady Cecilia. To get revenge, Don Pedro plots to capture the Japanese ship and enslave everyone on board. Lots of action and fine acting. Based on a story by martial artist Sho Kosugi.