Three months ago, a student jumped off a building and was found smiling when she was discovered. Two other students also jumped off the building and were found smiling as well. The students were all from different school years, but they all seemed to be in good spirits. The parents of the students demanded an explanation from the school, and the police determined that it was suicide, so the school had to suspend classes. The college entrance exams are soon to start and the consequences are too detrimental, the school urges the headmaster and the headmaster's assistant to return the students to the school.