Seventeenth century Japan: A rebellion in the Aizu territory has been brutally crushed, leaving twenty one brave warriors dead and most of the nuns of the local convent slaughtered. Now the surviving nuns have sworn to seek revenge.
With the Aizu Seven Spears on their trail, the Hori women are eager to learn to fight and avenge their men’s deaths, so they turn to swordsman Yagyû Jyûbei Mitsuyoshi to teach them the ways of the blade. Meanwhile, a masked spy has also drawn the ire of the Seven Spears. What does this mysterious figure want? And will the Hori women survive their first encounter with the killers?