Sachie Itakura is a mother struggling with her son, Masuo, who has repeatedly failed his college entrance exams. The root of her concern lies in his inability to focus on his studies. In reality, Sachie, calling it "breaking●," forces erotic acts upon her son almost daily to satisfy her own unfulfilled desires. These actions have left deep emotional scars on Masuo, robbing him of his motivation to study. As the family's bond teeters on collapse, Sachie's inner darkness and turmoil are brought to light.