A swordfight story taking place in Edo era (17th - 19th century). Yasuri Shichika is the seventh head of the Kyotou school of Japanese sword martial arts and lives in Fushou Island with his sister Nanami. With the order from a female samurai general Togame, he sets out for a trip to collect the twelve treasured swords created by a legendary swordsmith Shikizaki Kiki., while fighting off rogue ninja and samurai turned traitor to collect the blades using his fighting style that never requires never using a weapon.