Regarding Katsumoto as Kanja (spy) of Tokugawa, Doken ONO and his son Shuri ONO plot to tempt impulsive Ishikawa Izu no kami (Governor of Izu Province) to kill Katsumoto within the castle.
大野道軒は子の大野修理とともに且元を徳川の間者とみなし、直情な石川伊豆守をそそのかして城内にて討ち果たす手立てを講じる。