One summer day, Aika found herself having unknowingly consumed too much water. Suddenly, an overwhelming urge to urinate struck her. At that moment, she realized she was inside a crowded train, trapped with no escape, trembling in fear and humiliation. Around her, innocent students and busy office workers began noticing her distress, their curious eyes fixed on her. Her body shook uncontrollably as men's hands started reaching toward her. Then, a sudden voice rang out: "Hey, stop! ...Are you okay?" Aika believed that voice to be her salvation, placing her trust in it completely. However, its owner would become the one to forever change her life—ushering in a brand new hell of relentless rape.