In the year 1863, a time fraught with violent social upheaval, samurai warriors of all walks of life flock to Kyoto in the hope of joining the Mibu Roshi--a band of warriors united around their undying loyalty to the Shogunate system. In time, this group would eventually become one of the greatest (and most infamous) revolutionary movements in Japanese history...the Shinsengumi! Into this fierce milieu steps Kamiya Seizaburo, a young, would-be warrior who, though lacking in combat experience, possesses a fiery enthusiasm to both aid the Mibu Roshi in their mission and to avenge his wrongfully murdered family. One of the group's most gifted (and immature) swordsman, the legendary Okita Soji, agrees to take Seizaburo under his wing. But what no one suspects, least of all Soji, is that Seizaburo is actually a girl named Tominaga Sei in disguise! Will she be able to become a warrior and hide her true identity?