Yayoi, wife of the chairman of the Yanagida zaibatsu, is plotting to bring down her husband from the financial world by using illegal donations as a pretext and extort a huge amount of alimony. She is betrayed by Oshima, the chairman's secretary, who she thought was her ally, and Yayoi's plan reaches the chairman's ears... The enraged chairman orders his subordinates to train Yayoi as a prostitute specializing in anal sex. After being drugged and losing consciousness, the men dig into Yayoi's anus and forcefully insert their raw penises into it. The arrogant chairman's wife falls into anal slavery...