In the 1860s in Japan, a new era is dawning. During this time fraught with violent social upheaval, samurai of all walks of life flock to Kyoto in the hope of joining a band of warriors united around their undying loyalty to the Shogunate system. This group became one of the greatest (and most infamous) 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 Mibu-Roshi's most gifted (and immature) swordsmen, the legendary Okita Soji, agrees to take Seizaburo under his wing. What no one suspects, least of all Soji, is that Seizaburo is actually a girl named Tominaga Sei in disguise!