Three men sentenced to death are spared and changed into “shadows executioners”, a group of ruthless ninja working for mysterious high ranking officials. During their investigation on some illegal business, one of them, called “Yazuke the Viper”, 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 executioner”, with the task of completing her father’s mission.

When a fugitive begins a romance with the woman hiding him from the law, it becomes uncertain whether he will ever escape the shadow of his heinous crimes--or the detectives hot on his trail.

Rin Jyoshima lost her father to death-by-gambling; years later, she's grown up in the Kosugi household and has fallen victim to gambling herself.