Kojirō Satō, dubbed "Afro-kun," enters the narrative as a later addition to the core group, initially depicted as a studious yet unremarkable figure devoid of unique traits. Seeking individuality, he enlists aid to reinvent his image, culminating in a dramatic perm that reshapes his hair into a voluminous afro—earning his moniker. During a clash with a rival, his distinctive hairstyle is torn, leaving twin gaps that mold the afro into an angular silhouette. Though academically gifted, he struggles with social nuance, often misreading cues in conversations with women, his bluntness contrasting sharply with his intellectual prowess. The narrative offers no elaboration on his past, family ties, or subsequent growth beyond these events.