A female teacher, Aoyama Nana, is troubled by class collapse. When the distressed Aoyama consults with a colleague, she is told that class collapse is a manifestation of overconfidence due to having large breasts and that she needs to thoroughly torment her breasts and abandon her pride in being well-endowed. From that day on, Aoyama undergoes intense breast-torture training at school... while apologizing for the size of her chest...
