Watch Online Free on Watchseries. In Edo-period Japan, Shingo is born the son of an assassin who was executed for murdering her lord’s concubine. Decades later, his adoptive family is massacred for keeping the secret. Armed with an unbeatable swordfighting technique, Shingo embarks on the path of the masterless samurai in search of vengeance and a path beyond his own ignominious origins.