Keiko Imamura is a devoted mother, always worrying about her shy son. When he brings friends home, she finally smiles, happy to see him socializing. However, these so-called friends are actually the ones bullying him at school, and they've forced their way into her home, knowing he can't refuse. Emboldened, they begin flattering her, making lewd comments, and demanding to see her naked, escalating their behavior rapidly. Though initially coerced into complying, they return again after school, even when her son isn't home. To protect her beloved son, Keiko continues to submit to their demands—but as their abuse intensifies, the situation spirals into something far more degrading and uncontrollable.