HMN-875 A Room You Can't Leave Unless You Cum Inside: Four men and one woman are gathered together in a small space, locked in with the promise that their debts will be wiped out. Each time they ejaculate, the amount of debt they have to repay decreases, and they can leave the room. Because there's only one woman, she's repeatedly subjected to unprotected sex. (Rei Kuroshima)

Trapped in a small space containing only a bed are men and women who have been deemed unable to repay their debts. As a social experiment to combat the declining birthrate, the rule is that impregnating a woman will wipe out their debts. If they can get her pregnant, they can leave the room. The only woman is Rei, a struggling office worker burdened with debts from numerous consumer finance companies due to spending lavishly on male escorts. In this space with only one woman, the inevitable outcome is...