Magnum is a criminal organization consisting of foreigners who specialize in kidnapping, holding captive, and continuously raping women, turning them into slaves. 25 years ago, a female investigator failed to capture them and became a sex slave. 25 years later, Ren, the daughter of the former investigator, born from Magnum, harbors extreme hatred towards this organization. She is determined to wipe out Magnum to avenge her mother, who bravely fought against them in the end. Unfortunately, both she and her superiors are captured. They continue to rape her, even forcing her boss to participate. From this, she also learns the truth that her mother did not resist but quickly enjoyed the pleasure that these huge penises brought. Her boss was also one who had sex with her mother 25 years ago. Upon learning the truth, she doesn't know what to do, what to strive for. She gives up and accepts to become a sex slave for them, accepting a life similar to her mother's 25 years ago...