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. Now officially recognized as vassals of the Tokugawa family, the Shinsengumi move to a new headquarters and unite with renewed determination to face the threat of the shogunate's collapse. One night, Sei notices that the fierce warrior Okita is coughing violently in an adjacent room. She suspects the worst: tuberculosis.

What will become of Okita and Sei, and their secret love for each other?.