Mumyo Tsunataro killed his betrayed fiance Orie and He flees to Utsunomiya. On his way he happens to saves Chisaka Hyobu's daughter Oyu (She is exactly like Orie) be attacked by ninja. Thus he stays Chisaka's residence in Yonezawa. Chisaka was just trying to stop Forty-seven ronin's revenge against Kira Kozukenosuke by female ninja's sexual entrapment. Chisaka asks Tsunataro to lead female ninja. Tsunataro accepts the request on condition of marriage to Oyu.

山田風太郎原作の「くノ一」シリーズの第3弾。物語の骨子を「忠臣蔵」におき、四十七士とこれを阻もうとする上杉方の能登忍者、色仕掛けで赤穂浪士の復讐心を殺ごうと千坂兵部が放った「くノ一」忍者たちが三つ巴となって繰り広げる対決をエロティシズムと笑いで描く。