The first installment of this thrilling period drama special starring Matsukata Hiroki. Jubei fights to the death to protect the targeted Yagyu martial arts register. Set in the Edo period, shortly after Iemitsu became the third shogun, rumors spread within the shogunate that the register of the Yagyu family, the shogun's instructors, contained a secret that could threaten the very foundations of the shogunate. Jubei, the eldest son of the Yagyu family, asks his father, Tajima-no-kami, about the secret, but he remains silent and refuses to reveal anything. Meanwhile, Jubei, who is repeatedly engaged in battles with a mysterious ninja group for the register, learns an unexpected truth...