Yumika Saeki was a bank employee who had provided loans to her husband's restaurant. Despite knowing about the fraudulent lending, she turned a blind eye to it in order to cover her husband's losses. However, when the fraud was exposed, her husband's restaurant faced imminent bankruptcy, and Yumika was threatened with losing her job. Further pressured by the auditor who treated her body as a toy, she was forced into a sexual contract with a loan shark who agreed to provide financial support. Compelled to embark on a grueling journey of sexual servitude to repay the debt, the story portrays Yumika's inner emotions and psychological struggles amidst her desperate circumstances.