Shingo's Final Duel (1964)

Original title: 新吾番外勝負

After Aoi Shingo, the illegitimate son of Shogun Yoshimune has gained prominence as the finest swordsman in the land, he tries to lead a peaceful life with his mother far away from the seat of government in Edo. Not wanting to inconvenience his father anymore his plan is to stay away from the city and enjoy life like a normal man. Unfortunately for him, his past comes back to haunt him in the person of his mortal enemy, the one swordsman that is skillful enough to defeat him. This is the most perilous moment of Shingo's life as he must face his deadliest foe in a battle to the death!