Nanami lived peacefully with her father until her father's company suddenly went bankrupt. Shortly afterward, she was caught up in a tragedy. She was attacked by a group of sinister men, forcibly taken away, and brought to an auction site resembling a black market. There, sex toys were being auctioned off, and Nanami was treated as one of them. She pleads desperately, "Please... let me go home..." but her wish is ignored. Locked inside a steel cage, she begins training as a sexual object. Her daily life involves being slapped across the face each time she resists, inflicting deep psychological wounds, while being subjected to relentless sexual assaults day and night. This brutal existence gradually destroys Nanami's mind.