Riko Momose, the heiress of the former Zaibatsu Kurusugi family, is raped by Takezaki Takeshi, a member of the wealthy pervert club "Anal Mania Club," causing her engagement to be broken off. This incident leads to the downfall of the Kurusugi family, and Riko swears revenge while working as a health girl. Years later, news spreads that Aiko (Hazuki), the beloved daughter of Takeshi, is engaged to the heir of another former Zaibatsu family, reaching Riko's ears. Finally, she sees her chance for revenge.