 When a poor housewife named Yukie has a traffic accident, she is ordered to pay a large settlement to Taketo, son of the president of Nogawa Industries. Unable to make the payment, Yukie allows Taketo to have her sexually. Takato s vile plot traps the stepmother as she sinks into lusty desire. While his demands escalate, Yukie s stepdaughter, Rumi, tries to use her sexuality to make penance for her mother s mistake, and a sincere older stepsister and a curious younger stepsister are doomed to become love slaves.