In the fading days of the samurai era in 1863, Japan grapples with internal strife between pro-shogunate and anti-shogunate factions. The world's stability is jeopardized when time-traveling historical manipulators arrive to reshape the past. To safeguard history, two spirit warriors embodied in the form of swords by the wise Saniwa embark on a mission to Edo. Horikawa Kunihiro, characterized by his politeness and introspection, joins forces with the hot-tempered yet skilled Izuminokami Kanesada, both once loyal to the same master. Together with a spirited band of warriors like Mutsunokami Yoshiyuki, Yagen Toushirou, Tombokiri, and Tsurumaru Kuninaga, they clash with the intruding army. The destiny of the world hangs in the balance as these heroes wield their swords against an uncertain future.