Mother Yuu runs a small inn with her daughter Mirei and her husband. But when her husband falls ill and is hospitalized, Yuu is at a loss and tries to run it with Mirei. In the midst of all this, men from the loan sharks who had lent money to her visit as guests. Instead of collecting their debts, they plan to deceive Yuu and Mirei and make them fall into the underground sex industry. First, innocent Mirei is penetrated by her fully developed busty body, and when this fait accompli is presented to Yuu, Yuu is unable to resist... a hellish sexual picture scroll in which she is even impregnated!