Mitsuki's mother remarried and she was getting along well with her new father. But that happy life has changed! On the morning train to school, someone groped her buttocks, pulled down her panties and ejaculated inside her even though she was on the train! This was clearly a different kind of abnormal behavior from normal molestation! On the day of the three-way meeting where her father also came, she was attacked by someone again even though she was at school. Who could it be... Could it be that person?! No way, no way... Today, she boards the train to school in fear again.