In a vibrant Edo-era Japan brimming with diverse sword-fighting schools, Shichika Yasuri practices an unconventional art: Kyotouryuu, where the body becomes the blade. Living in seclusion with his sister Nanami, Shichika, the mysterious seventh head of Kyotouryuu, is thrust into action by the ambitious strategist Togame. Tasked with acquiring the legendary 'Deviant Blades' for the shogunate, Shichika joins forces with Togame not for politics but for his curiosity about her. Together, they embark on a perilous quest, facing skilled swordsmen and power-hungry foes. To overcome these challenges, they must unite as an indomitable team, navigating a dangerous path fraught with uncertainties and dangers.