The fair-skinned beauty Yui gets lost and seeks shelter in a private home in the mountains. Goro kindly takes care of her, and they begin a loving life together. Feeling sympathy for Goro, who is struggling with debt, Yui agrees to sell her body to a scheming moneylender. Goro proposes to her, saying, "Once you've paid off your debt, will you join me?" Yui feels guilty, but before she knows it, her body is being trained and becoming the property of the man.