Third entry of the series.

The war between the Iga and Sanada ninja clans is heating up, and a prominent gunsmith is on both clan's radar. Shinsuke Kakei, the gunsmith, is essentially a pacifist, but believes his weapons can bring peace to the land if put in the hands of the right group. Kasumi is sent to convince Kakei to come and work for them, and keep the guns out of the hands of the Iga. Of course Hattori, along with his sister Sayuri, have other plans for Kakei and his wife.

A historical drama Eros drama based on the original comic by Yoji Kambayashi. (Compilation film of Lady Ninja Kasumi 4, 5 and 6).