This is a story of a woman, amid in her sorrow, seeking for vengeance... In the town of Osaka, a serial murder targeting the Japanese mafia - kurosawa kai - members has occurred. According to the investigation of the police, the victims are cut in half by a sharp knife, as if they are slaughtered by a man who is a master of swinging his sword. This is done in such a skillful way that everyone can tell it was done by a professional. One of the officers of Kurosawa kai, Aramaki seeks to catch the killer; however, the number of victims rise as his anxiety continues to build up. While according to the report from the hit man hired by the leader of kurosawa kai, a clue floats to the surface - a clue that closely related to "sekiryu" (red dragon)... The reviving of an ominous memory... The truth of the brutal murder of the Asahina family, and the shadow of vengeance... One woman steps forward, before Aramaki is able to comprehend the truth...