Kasumi and Kaho have inherited debt from their stepfather and are being persecuted by loan sharks. Good-natured Hiroyuki, a good friend. When he hears the story of their debt, he tries to help Kasumi and Kaho. If they cannot repay their debts, they have to work in the red light district. Hiroyuki does not want that! He sets up a contract for Kasumi’s debts. So she becomes his sex partner.