Having left Shūsaku with the nun, Koshinjo, in the convent at Odawara, to keep him out of danger, Shintarō and Tonbei set out alone. Tonbei comes up with a plan to find out the strength of the remaining five Fūma. He sends Saizō of Iga, posing as a wandering ninja, to ingratiate himself with Kotarō with a false map given to him by Shintarō. Then he lures out the Fūma, one by one, and kills them. First into his trap is Hagakure Tanba, at Ashigara, near the Water Castle.
