Shichika Yasuri, the seventh head of the sword-less Kyotoryu style, has spent his whole life training on the isolated island of Fusho without ever touching a blade, since his family fights bare-handed instead. Togame, an ambitious strategist working for the shogunate, recruits him to travel Japan and collect twelve legendary swords forged by a single swordsmith, each with a deviant power of its own. She also orders him to fall in love with her, certain that nothing outranks love as a temptation.