Yuuki Kamimura and her mother, Yumiko, were living a modest life in a shabby apartment. Since his father's company went bankrupt, Yumiko earns money by working part-time, and Yuki attends school while working part-time.

Nanba, an illegal moneylender, had come to collect his father's debt. In addition to the principal amount of 3 million, Nanba demanded a huge interest rate. Yumiko has no way to repay the debt, so Nanba makes a proposal.

"We sell pornographic videos that we can't show in public. How about having your wife act as an adult film star in the video?" Yumiko accepts the proposal for the sake of her family. Yuuki is shocked to hear that her mother is a porn star.