Natsumi, a student at a girls' high school in Tokyo, draws attention from boys due to her precocious body. She's a well-known figure at school, her innocent heart and youthful physique captivating many men. However, she becomes entangled in malicious acts such as stalking, sexual harassment, and blackmail. Her immature mind and body are easily damaged and broken by the hands of adults. Her everyday life is silently swallowed by darkness, unknown to anyone around her.