Maki, a female teacher who has just returned to work after her maternity leave, is soon faced with a problem on the way to school and volunteers to be a chaperone. However, her sexually frustrated body quickly succumbs to the perverted finger techniques. While making excuses like 'to prevent other children from being involved in perversion,' Maki continues to obsessively seek out the secret affairs during her commute. Before long, Maki becomes awakened to the shame and pleasure of being toyed with in a crowded train. And today, as usual, she boards the train...
