"Cage Chapter 1: Sakimi Endo has finally become Takuya Kakizaki's girlfriend. She thought this happiness would last forever, but something's wrong. Her perfect dreams shattered when she was betrayed by her boyfriend and now she has an incredible amount of debt on her. Not being able to pay this off, she's now forced to become a sex slave to countless strangers in order to pay off the debt. Her life switched instantly from heaven to hell in a blink of an eye! Just when she thought her life is in despair forever, she receives one mysterious mail. This mysterious mail guides her the way she can get out of this nightmare. And of course, she had her worries and doubt at first, but this was the only hope she has been waiting for. So she heads for the club named "Canary" which was written on the mail. When she arrived, the one who was waiting for her behind the door was the owner of the club "Canary", Amamiya.