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Can't really think of a specific plot for this yet, but here's the general concept:
"Various shogunates are waging war on each other in ancient feudal Japan. A general from one shogunate discovers ancient scroll fragments about rituals and techniques of a martial art that grants its users superhuman strength by absorbing and utilizing a Qi-like ecological lifeforce found in nature. The catch: First, it can only be used by women, and second, the woman must be completely nude so to allow the unhindered absorption of ecological lifeforce into her body.
The other shogunates also found fragments of the scroll and formed schools to train women of this martial art. Only a few gifted women are able to use this power to the fullest extent, making them the primary combatants in this new stage of the feudal war."
My inspiration for this was Ikkitousen.