This chapter opens with a flashback to class 9 , in which the protagonist is introduced to the protagonist's half-brother, Lu shengyu, who is the head of the school's sports department. Lu is the one who keeps track of the students' daily exercise routines, which he calls "calisthenics" . He is also the person who tells the protagonist that he is supposed to meet with the protagonist on the campus. The protagonist is excited to meet his half-uncle, but he is also worried that he will not be able to keep up with the pace of the class. He worries that the protagonist will lose interest in the exercise routine, and so he sends the protagonist off to take a picture of the protagonist