Sou and Keigo, who have been close friends for a long time, have begun a romantic association, but Sou is becoming increasingly annoyed as Keigo shirks any initiative towards consummating their relationship. To make matters worse, Keigo neglects to bring a present to Sou's birthday festivity. Furthermore, the novel comprises a subplot regarding Sou's father, as well as Mamoru and Hiroki's experiences in high school.