In 1863, Izuminokami Kanesada and his partner, Horikawa Kunihiro, arrive in the streets of Edo from the future to investigate their master's reports of an upcoming enemy invasion. As humanoid manifestations of the famous Toshizou Hijikata's swords, they have been tasked with protecting history from the Retrograde Army that seeks to alter it. Soon enlisting the help of other sword warriors, they continuously battle th...