In the third installment of Yoshikawa's novel Musashi, things continue from the 2nd film at the end of battle, where Miyamoto continues on a mission of learning; with the introduction of his arch-rival Sasaki Kojiro; and lastly the large cast of characters rendezvouses for a fateful finale.
Miyamoto Musashi / Takezo
Otsu
Hon'iden Matahachi
Osugi
Jotaro
Uncle
Oko
Akemi
Yoshioka Seijuro
Yoshioka Denshichiro
Hayashi Kichijiro
Toji - Gion Fujitsugu
Naota Ryohei
Yokoyama Kansuke
Oike
Kobashi
Sasaki Kojiro