Yui, a fair-skinned and pure-hearted beauty, finds herself lost and takes shelter in an old mountain farmhouse. She is tenderly cared for by the kind and considerate Jiro, and the two begin living together in harmony. However, wanting to help Jiro, who is suffering from debt, Yui makes the fateful decision to sell her body to a ruthless loan shark. As she follows through on her choice, her resolve begins to waver. Though she feels guilt toward Jiro's marriage proposal, she gradually becomes aware that her body is slipping further and further into the hands of other men.