Jiiya is the elderly chauffeur for the Ōno family, serving for many years as the personal driver of Ōno Akira. Deeply loyal and caring towards Akira, his duties extend beyond driving to actively facilitating her arcade visits, despite the strict oversight of her tutor, Moemi Goda. He occasionally breaks rules to support Akira's interests, such as defending her against Moemi's disciplinary measures.

A self-identified pachinko enthusiast, Jiiya exhibits a recurring habit of accidentally running over Haruo Yaguchi with the Ōno family limousine. His relationship with Akira is characterized by protective devotion, consistently prioritizing her emotional well-being and personal happiness over rigid household protocols.