Goro Amaji is Kakeru Daichi's classmate and friend, though his lack of presence causes others to frequently overlook or forget him. Kakeru ironically nicknames him "Gigolo," a stark contrast to Goro's significant struggles with romance; he is far from being a ladies' man. He harbors a persistent crush on classmate Yurika Kochikaze but consistently fails to express his feelings, often being ignored or overlooked by her.

Despite his near-invisibility and romantic misfortunes fueling a comedic role, Goro demonstrates reliability during critical moments, willingly assisting friends when needed. He lives at home with his three sisters, all sharing a single bunk bed. Goro participates in group activities, such as observing others during dates or outings, maintaining his role within the social circle even as he tends to fade into the background.