1580. Ninja Kotaro gets killed by the evil Hattori Hanzo after he discovers that the local shogun and his son aren't related. It's up to Kotaro's nubile and innocent virginal daughter Kaede to exact revenge on Hanzo for bumping off her dad. Kaede learns various lethal sexual martial arts techniques in order to accomplish this particular goal.

In a turbulent and chaotic era, a love blossoms between a yakuza betrayed by his gang and an innocent girl.