"I'll never treat you like strangers again... It's all your fault he's gone..." Five years ago, their mother remarried a man who ran his own company, and the sisters began living a comfortable, carefree life. However, their mother, who had been working nonstop, fell ill and started repeatedly checking in and out of the hospital. Her husband grew furious that his happy life was being threatened, and he developed both anger and sexual desire toward the sisters, especially as they acted defiantly toward him. He threatened them: "Which one of you is going to sleep with me? If you don't decide, I'll break both of you." Under fear and twisted pleasure, he gradually turned the sisters into his sex slaves.