"I'll definitely repay the money my husband borrowed..." A man from the underworld comes to collect the debt even at the hospital where her husband is hospitalized. He proposes an underground casino side job to Saki, who is devotedly caring for him, as a way to make a lump sum of money. "With your wife's beauty and body, you can make a lot of money quickly," he says, and takes her there. However, at that illegal underground casino, she's forced to wear a revealing uniform that exposes her breasts and serve wealthy clients. And then, things escalate to even more extreme sexual acts... Trapped in a debt hell and covered in shame, she becomes a sex slave dedicated to the underground casino, her voluptuous body used for servitude.