27-year-old office lady Akari Niimura. Since her teens, she's been obsessed with gambling and has suffered from massive debt. Though she managed to recover and live a normal life, recently she was invited by a man she met at work to play mahjong again after a long break. She resolved to win and keep winning, but soon found herself addicted to gambling once more. Now, despite her stunning beauty, she's drowning in debt again. That night, she undergoes an enema to cleanse her rectum, is thoroughly anally penetrated, tightly bound, and forced to perform oral sex through her back door. Ultimately, she falls into a tragic existence as a sex slave and cumdump for vicious beasts.