In the fourth installment, Musashi's potentially greatest opponent Kojiro jumps in and out of the story at the oddest and most coincidental moments. As his great love Otsu has succumbed to madness. Musashi then sets off to beat the functionaries of a treacherous clan in an arranged duel. 73 against one. Boastful Kojiro watches, secure in the knowledge that only he is a worthy opponent.
Kinnosuke Nakamura
Wakaba Irie
Isao Kimura
Chieko Naniwa
Mitsuru Takeuchi
Satomi Oka
Shinjirô Ehara
Mikijiro Hira
Ken Takakura
Chōichirō Kawarasaki
Kei Tani
Kusuo Abe
Chieko Higashiyama
Eijirō Tōno
Masao Oda
Kei Satō
Masaharu Arikawa
Hiroshi Arima
Daisuke Awaji
Tokumaro Dan
Isamu Dobashi
Kenji Egi
Hideo Fujimoto
Yoshiko Fujishiro
Mitsuru Hagiwara
Tokue Hanazawa
Hiroshi Hatano
Shōtarō Hayashi
Yûji Ichikawa
Kaneko Iwasaki
Ryōsuke Kagawa
Minken Karasawa
Hanzô Kataoka
Reiko Kaze
Shūjirō Kijima
Yachiyo Kirishima
Yoshio Kirishima
Kazutarō Kuni
Kenji Kusumoto
Toshio Matsuda
Tsukie Matsuura
Hachirô Minamoto
Hiroshi Mizuno
Seiji Mōri
Kinji Nakamura
Tokinosuke Nakamura
Keiko Ono
Yoshiki Oyamada
Kōji Sekiyama
Koreya Senda
Hideo Shimada
Keiichiro Shimada
Kin'ya Suzuki
Shin Tokudaiji
Hiroshi Tonegawa
Isao Yamagata
Kyōko Yasaka
Yasushi Ôki
Yôichi Ôyama
Michiyo Kogure
Rentaro Mikuni