Masaki Azuma, 18, is a member of the idol group Mr. Doctor, previously joined by protagonist Yu Arimura before Yu's departure for horse racing school. Azuma presents a calm demeanor and displays distinct leadership qualities within the group. His appearance features distinctive mauve hair and green eyes, typically seen in a white jacket, pink shirt, white pants, and black shoes. Information regarding his personal backstory, character development, narrative progression, or involvement in events beyond his initial association with Yu's idol career remains unavailable. References confirm the series has a single 13-episode season, with no sequels, films, OVAs, or spin-offs featuring expanded arcs for Azuma. Details about his specific actions, relationships, or evolution throughout the series or other official media are absent.