Cage / Kanariya wa Kago no Naka

The hentai is based on the eponymous manga series by Nakamura Uzuki released in 2001. Sakimi Endo fell in love with her classmate and was so infatuated with him that she didn't notice how she was deceived and dragged into huge debts. To pay off the debt, she started engaging in prostitution, having sex with various perverts and scumbags. Her life completely changed, turning into a continuous nightmare. Soon Sakimi receives a mysterious letter in which she is offered a way out of this endless sex routine. But is the stranger offering help really that selfless?