Hanpei is a gentle young samurai that loves flowers. One day, he witnesses an old man's quick draw of the sword. He is so impressed that he becomes the old man's pupil. Soon, Hanpei's skill of sword comes to attention of his lord. The lord orders him to assassinate a man...

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.