Director:
The abbot of Bodhi Temple / Charity / and the Black Shovel Ninja learned of this and wrote a secret letter and sent it to Edo. Bai Yidao (played by Tomisaburo Wakayama) was entrusted by the Kuroda clan to chase the host and steal the secret letter. On the way / he met the Kuroda clan ninja Shiranui (played by Michio Yasuda) and learned the secret behind the incident from his mouth. After successfully snatching the secret letter / Yagyu Retsudo (Oki Minori) sent a large number of assassins to intercept and kill them / but they all died at the hands of Bai Yitou. An important minister of the Kuroda clan / General Riten / reprimanded Marquis Qilong for using his daughter to succeed him as the crown prince / intending to kill him for treason. Bai Yitou / who was entrusted by Shiranui / was involved in this succession crisis...
黑田藩藩主齐隆侯将宠爱的妃子生的女儿滨千代公主假扮男孩，秘密继承储君之位。菩提寺住持慈善和黑锹忍者得知此事，写作秘函送往江户。拜一刀（若山富三郎 饰）受黑田藩所托，追赶主持抢夺秘函。 途中拜一刀遭遇黑田藩忍者不知火（安田道代 饰），从其口中察觉事件背后的秘密。秘函抢夺成 功，柳生烈堂（大木实 饰）派出大量刺客截杀，但全部死在拜一刀手下。黑田藩重臣肋天将监斥责齐隆侯用女儿继任储君，意欲杀其谋反。受不