This is about better swordsman than famous lonely samurai (ronin) Miyamoto Musashi (Shinmen Takezo). Like Douglas Macarthur, his father is a senior ranking military officer. Arthur Macarthur in this story is SHINMEN Munisai, a respected swordsman who taught art of Japanese Sabre (Kenjutsu), to generals (taisho), prime minister (shogun) and emperor (tenno). His title as World's Unrivalled Swordsman, bring many opponent challenge him. As a senior military officer, he could not just do fighting for a personal reason. All remaining sword instructor in Japan had been lost to him in the sword's battle. Only his own son refuse to learn swordsmanship from him.