A sincere older step-sister and a curious younger step-sister are doomed to become love slaves. One day a house wife named Yukie has a traffic accident. She is ordered to pay a large settlement to the other party Taketo the son of the owner/president of Nogawa Industries. Unable to make the settlement payment Yukie allows Taketo to have her sexually. At the same time Takatos father Nogawa approaches Yukies step-daughter Rumi and blackmails her. His evil scheme even reaches for Tomoko Yukies younger step-sister.