Wrath of Daimajin

In the mountains of feudal Japan, Lord Arakawa has taken the men from the surrounding villages and put them to work in his sulfur pits, making gunpowder. Kazuo Mori follows a band of young boys, Tsurukichi (Hideki Ninomiya) among them, who decide to go after their enslaved fathers by themselves. They are children walking into the territory of a lord with an army, and the men they are searching for are still working in the pits.