One day, Chihiro, a mother of a high-achieving son who is preparing for entrance exams, is called by her son's homeroom teacher to discuss his future. Chihiro visits the teacher, but the teacher tells her that there is an unexpected obstacle to her son's future. In order to resolve the obstacle to his future that she cannot solve on her own, Chihiro gives in to the teacher Honda's demands, and ends up being taken advantage of...