"Sweet and Sour Memories" is the title of the third chapter of the novel, which is set in the fictional world of the underground idol scene. In this chapter, the protagonist is introduced to the world of idol management, who has raised countless idols to the status of superstar status. The protagonist asks the protagonist about his performance at the concert, and the protagonist tells him that he was bored, and that he and his friends were not enjoying themselves. He tells the protagonist that they were super into the performance, but that they lacked "that inner cuteness." The protagonist promises that he will fix this problem. He says that he is going to fix the problem of the protagonist's "rotten mental state" by imagining that the protagonist was once a happy, innocent child. He imagines the protagonist looking up to the second-in-command of a criminal organization, and imagines that he wanted to tell the sub-leader of the organization something but didn't get to. He apologizes for putting live bullets in the chamber, thinking that he would get his own hands dirty.