Although financially struggling, the Shinozakis live a modest and happy life. One day, Nakata, claiming to be a financial product broker, visits them. Kanna, who has never had a single luxury, is attracted by the money-making opportunity Nakata presents to her. However, the opportunity is a trap to lure Kanna into lewd acts. Nakata makes Kanna sign a forged purchase contract, and in exchange for making payment, he lures Kanna into working as an underground prostitute, operating from his own home...