Hiroshi "Hakase" Sugiura is a schoolboy character within the narrative. He forms part of a distinct boy gang in his class, consistently appearing alongside his peers Yoshio Kawabata and Kazuteru "Teru" Yoshimura. The nickname "Hakase," meaning "Doctor" or "Professor," hints at a scholarly reputation or intellectual bent acknowledged by his classmates and evident within the group's interactions. His documented presence focuses solely on his role within this boy gang and the association with his academically suggestive nickname.