Ryutaro is a spy employed by the shogun Tokugawa Iemitsu, who is the target of assassination attempts that aim to hand power over to his younger brother Tadanaga.

• Shintoho Company
• Hiroshi Ogasawara
• Akemi Tsukushi
• Tetsuro Tamba
• Konomi Fuji
• Sachiko Tôyama
• Yōichi Numata
• Masao Mishima
• Unpei Yokoyama