Newly hired teacher Nao visits the home of her student Shinao, who has been refusing to attend school. Kind and beautiful, she only wishes to hear his story, but through Shinao's scheme, she loses consciousness. In a hazy state of awareness, Shinao confesses his deranged desire: "I want to pin you down, sensei." Her unresponsive body is relentlessly licked and violated as she is drowned in a sea of semen. Soon, Shinao's father and older brother appear, turning Nao into the family's shared sex toy. Day and night, she is repeatedly bred and filled, until gradually her twisted masochistic desires awaken, and she begins walking a new, depraved path...