Three men sentenced to death are spared and changed into “shadows executionersâ€, a group of ruthless ninja working for mysterious high ranking officials. During their investigation on some illegal business, one of them, called “Yazuke the Viperâ€, finds his abandoned daughter, Ocho, who has now become a mistress of Denzo, a smuggler. After Yazuke’s death, Ocho is also recruited as a “shadows executionerâ€, with the task of completing her father’s mission.
