Juzo Futami, a secret agent who investigates the secrets of the Senba Iwaki gang in Tosa, who are plotting to overthrow the Tokugawa shogunate, is attacked by the gang and almost in danger, but is rescued by Tenma Tenpei, a nobleman from the world. Juzo, who was rescued by Tenpyo, tells him that there is burning water on Karasu Mountain in Tosa and asks him to protect him until he gives the shogun a map showing the location, but...