An attractive housewife named Yukie has to pay a man named Takato through sex since she doesn't have physical cash. But she is actually being blackmailed by both Takato and Nogawa,
Yukie is sleeping with Takato to make up for her debt she owes him but her stepdaughter, Rumi now may be falling for it as well.
Takato have found out that both Yukie and her stepdaughter are gaining the upper hand, so he tries to seduce their stepsister as well.