The legendary swordsmith Shikizaki Kiki made 1000 swords in his career. The more of these swords a state had, the greater the success in battle. When the Shogun emerged victorious, he collected 988 of the swords... but those were only the swordsmith's inferior practice pieces. For the final twelve swords were the pinnacle of his career. Each of them has powers so extraordinary, that one man wielding one of them could defeat a small army.
Shogunate strategist Togame has been ordered to recover all of them. She first hired a ninja... but the worth of the swords is so great the entire ninja clan defected the moment they recovered one. Then she hired a swordsman... though bound by honour, he felt he should keep the sword for himself.
Her last hope is Shichika, the seventh and last practitioner of the Kyotoryuu — the No Sword School. He and his sister live on an island cut off from civilization — so they have no need or use for money. His sword school does not use swords either — so he would not want the swords for himself.
So why should he help Togame?
"Because you will fall in love with me."