Mitsuki lived happily with her mother and her new stepfather—until a sudden incident shattered her peaceful life. On her morning commute, someone groped her from behind on the crowded train, yanking down her panties and penetrating her right there in public. This was no ordinary molester—it carried a dangerous, sinister intent. The attacks continued, striking again on the very day her father came for a parent-teacher conference, right inside the school. Who could be behind these assaults? Could it be someone close to her? Unthinkable suspicions begin to creep into her mind. Now, every day on the train, she rides in silent terror, fearing the next attack.