First, it should be normal for high school students to regard male teachers around the age of 30 as reliable emotional release objects. As a high school student, I can be sure of this according to my experience. Second, it was Keiko who told the PE teacher to exchange clothes, and later that person revealed it. As for the man who drives the car and the man who kills people, he is the lover of his wife. In fact, the whole book has been expressing his wife's dissatisfaction with him. Finally, he called his wife and told her that I dumped the police and they were determined to kill the man.