Yoshio Hanamori is the chauffeur for the politically powerful Koibuchi family, sharing a deep-rooted childhood friendship with Shū Koibuchi that transcends their professional relationship. His duties focus on vehicle maintenance and transportation, driven by an intense passion for luxury automobiles—specifically Mercedes-Benz in the original manga, anime, and live-action film, though this preference changes to Lexus in the 2018 live-action television series. This obsession translates into meticulous car care, a trait others frequently exploit for leverage through bribes or pressure. He exhibits a personality blending self-interest with a core decency, often expressed through smooth talk and flirtation. A peculiar weakness makes him unable to refuse requests from individuals sporting afro hairstyles. Despite his role demanding discretion, he consistently struggles to keep secrets under pressure or enticement. Physically, Hanamori has black hair and brown eyes, typically dressed in professional chauffeur attire. Beyond driving, his artistic skill is strictly limited to sketching automobiles; he renders Mercedes-Benz models with accuracy while other subjects become indecipherable. Relationships significantly shape his story. His bond with Shū involves personal loyalty alongside frequent meddling. Romantically, he pursues multiple connections: he secures a date with Nisha using a reservation originally meant for Shū and Tsukimi, and later engages in mutual flirtation with Mayaya, culminating in dramatic moments like catching her during a fall at a fashion show. Across all media adaptations—manga, anime, film, and live-action series—he uniquely holds unrestricted access to Amamizukan, the women-only communal apartment. This privilege enables his involvement in the residents' activities, supporting their anti-development protests and participating in their fashion initiatives. His background includes shared experiences like attending abacus classes with an associate named Sugimoto.