AllMovie

An Edo Period commoner discovers a weapon more powerful than the sword when he crosses paths with a female ninja on a dangerous mission. Yasaburo isn't a samurai, but he's devoted his life to becoming an expert swordsman. Upon encountering what appears to be a desperate prostitute, the benevolent peasant quickly comes to her aid. But Rin is no prostitute; she's a deadly Kunoichi in disguise, and she's on a mission to find the source of illegal aphrodisiacs being smuggled into Japan. She's never missed her mark, and she's about to confront her most deadly foe to date.