Suzunosuke visits a martial arts master and tries to learn the 'Vacuum Slash,' a secret technique of producing tornadoes.

Soft-Boiled Goro is a 1970 film directed by Kazuo Ikehiro

One day, a funeral was held at one of the tenements in Asakusa.
It was the only son of a wealthy merchant named Matasaburo, who had run away from home with a woman he was in love with and had been living here.
But this funeral was actually a kyogen (a farce) orchestrated by a gardener named Yunosuke, who had planted it without telling his wife, Okinu, in order to bilk his parents out of their money.
Matasaburo believed Yunosuke, who said he would dig him up right away, and was buried in the ground. ......

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.