At the end of the Edo period in Kyoto, the ronin Kurayoshi Norizen rents the second floor of a hardware store and lives a carefree life, running a temple school. However, his true identity is Kurama Tengu, who appears to help a patriot in a difficult situation when he is attacked by the Shinsengumi, and then disappears like smoke.

In a mountainous region of Japan, Lord Arakawa kidnaps the men of nearby villages to use as slave labor, producing gunpowder from his sulfur pits. A band of young boys decide to rescue their enslaved fathers on their own.