Kenji Misumi's Trilogy of the Sword

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.

Kokubu, captain of his university's kendo team, is a mystery to those who know him: An ascetic dedicated to a point of obsession with the simplicity and beauty of the sword arts. Kagawa, a promising but arrogant kendo student, is attracted to Kokubu's devout leadership but kept at a distance by his standoffish nature. With the national championships fast approaching, the pair clash as Kokubu drives his students with increasingly rigorous training and Kagawa tests Kokubu's grip on the class.

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...