In a deadly terrorist attack, Arashi Mikami barely survives but loses everything, including his family and best friend. The surgeon who rescues him is far from an ordinary doctor; he commands a strike team called Black Label, tasked with exterminating dangerous criminals who have gone too far. Driven by new resolve, Arashi joins this vigilante organization. Black Label has plenty of targets, as wicked individuals lurk everywhere—dangerous arms dealers, corrupt politicians, and shady gangsters are all hunted by the extermination squad. Though haunted by their dark and sinister pasts, all the hunters are highly skilled at killing their targets. Despite the perilous lives they lead, Arashi and the attractive women around him still find themselves involved in various sultry moments and racy antics. Although they face strong opposition, nothing can halt Black Label's goal of purging the world of ghastly evil.