A man of questionable birth peacefully raises flowers, but after he masters a special sword-fighting technique, his life takes a dark turn.

Hanpei is an orphan mistreated by other vassals of the manor. He loves flowers and is named the castle gardener. One day in the forest he meets a samurai who teaches him his technique. To conceal the mental illness of lord of the manor, Hanpei is ordered to kill all the spies of the shogun and rebel vassals.—ccarneiro0707