Katsuta Daiyamondo

Five years after the all-out war between the Sanno and Hanabishi crime families, former yakuza boss Otomo works in South Korea for Mr. Chang, a noted fixer. When tensions rise between Chang and the Hanabishi, and Chang's life is endangered, Otomo returns to Japan to settle things once and for all.

In war-torn 17th-century Japan, Tokugawa Ieyasu sends his trusted samurai, Mayeda, and his son Yourimune to Spain. There, they're to buy five thousand muskets. But it is a dangerous journey, and there are many who conspire against them.