Ai Shimai: Futari no Kajitsu / Immoral Sisters 1

This story focuses on the adventures of two Japanese schoolgirls. In one family, incredible events occur that can turn the lives of its members upside down.

A rich and distinguished woman, a wife and mother of two children, finds herself in a difficult situation. Her vulnerabilities become known, and now she is forced to face challenges that seem unthinkable.

A housewife named Yukie gets into an accident and finds herself in debt to Taketo, the son of the owner of industrial enterprises in Nogawa. Due to lack of money, Yukie agrees to Taketo's terms and allows him to "own" her sexually.

At the same time, Taketo's father, Nogawa, blackmails his stepdaughter, Rumi, into fulfilling his base desires. Even Yukie's younger half-sister, Tomoko, is caught up in Taketo's devious plan.