At an inn in Oiso, Shintarō wonders what the secret of the three mirrors is and sends Tonbei and five Iga ninja to Edo to find out. As they are about to cross the Sagami River, they are ambushed. They take refuge in a hunter's hut near Fujisawa with Tonbei wounded. They are surrounded by Fūma and pinned down. Two attempt to break out to get help but one is killed and the other escapes. Kotarō and some Fūma ninja arrive at the inn at Oiso and set fire to it. They attack Shintarō as he runs out with Shūsaku.
