To help her boyfriend pay off his debts, she falls into prostitution... becoming a sex toy for an older man, a voluptuous girlfriend trained to have her vagina stimulated. Nanami Nami DSOD-052

Although Nami felt her boyfriend was a good-for-nothing, she also felt sorry for him and couldn't let go, so she tried everything to help him pay off his debts. One day, she discovered a service called "Debt Repayment Agency" and decided to use it. As the price for repaying the debt, Nami had to complete a task assigned to her, and in doing so, she had to undergo various training sessions.