Romance between swordsmen, based on a true-life adventure of a young girl determined to be a part of history. 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. In time, this group would become one of the greatest (and most infamous) movements in Japanese history. the Shinsengumi Posing as a man, Sei trains with the Shinsengumi and does her best to survive the turbulent times. After initially attempting to seduce Sei, the aristocrat Yoshinobu begins to tell her about his past and why he is unwilling to become the next Shogun. Later, his decision to request an imperial order to stop sectarian fighting enrages power-hungry councillor Ito to the point that Ito approaches vice captain Hijikata with plans for overthrowing the shogunate Meanwhile, Nakamura Goro, who is on Ito's side, becomes jealous of Sei's relationship with Soji.