A coal sales company is on the brink of collapse, and the husband, Kenki Kiyama, is saddled with a massive debt. To get through this difficult time, his wife, Mikie, decides to work for a financial firm and offers herself as collateral. Although there is a six-month grace period, every time she fails to make her monthly interest payments, she is forced into sexual encounters. Mikie gradually falls into a conspiracy with the purchasing agent. The husband continues to worry about his wife, while Mikie endures each agonizing day by trusting and relying on her husband…
