The murder of the chief official of Kobe city's Customs triggers an investigation of a prostitution ring called the 'Yellow Line' that sells Japanese women. A hired assassin is betrayed by his organization, and kidnaps a woman who happens to be the girlfriend of a newspaper reporter.

Kind-hearted girl next door beauty (Junko Ikeuchi) turns the heads of all the handsome boys, so three other models decide to push her off the nearest cliff. But her aunt is a witch who grants her monstrous powers to transform into a beast and get her revenge.