Yagyu Jubei, the finest swordsman in the land, is called upon to bare his blade to help Iemitsu keep his post. Meanwhile a fishmonger named Isshin Tasuke who bears an amazing resemblance to Shogun Iemitsu may be called upon to put his life on the line by acting as the Shogun's double. At the same time, the tragic story of Banzuiin Chobei and Mizuno Jurozaemon is unfolding.