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. Emperor Komei dies shortly after the brash aristocrat Yoshinobu becomes shogun, and the political climate darkens. Then the scheming Councilor Ito invites Saito, who has been like a brother to Sei, and Nagakura, leader of the Second Troop, to a private banquet. Will he risk their lives by keeping them out past curfew?!