松平定信
Set in May 1788, the story concerns the mission of Shintarō, aided by Tombei and his group of Iga Ninja, to stop Momochi Genkurō (played by Toshiyuki Katsuki), the best swordsman in Japan, and the leader of a renegade group of ten master Iga Ninja from the Manji Valley who are hired by the Lord of Owari to assassinate Matsudaira Sadanobu on the Tōkaidō road in the region between Edo and Kyoto. Unknown to his employer, Momochi himself has a secret agenda, to plunge the country back into civil war and revive the golden age of ninjutsu. His group includes a woman ninja Okayo, who at first wants to avenge the death of her brother Koheita, but later develops feelings for Shintarō (a similar character, Kazeba the sister of Nuinosuke, appears in the follow-up story), and Gensai the Wolf (Okami no Gensai) played by Amatsu.