Riho Asaoka was at the forefront of an investigation to crack down on the vicious drug trafficking organization "Kurorankai." One day, she headed to an abandoned building where she had received a tip. However, it was a trap set by the Kurorankai, who had been planning to capture Riho from the beginning. In front of the criminals, she desperately pretends to be strong, but she is immersed in pleasure and loses her reason. And then the "sexual beast" lurking in her awakens.