Kinako is a train enthusiast candidate who answers Yokomi’s call for fellow rail fans to join the travels. She enters the group in later volumes of the original manga, offering a contrasting perspective to the main trio. As a female train enthusiast, Kinako holds considerable knowledge about railways, though her enthusiasm is more measured compared to Yokomi’s obsessive approach. Her presence introduces a distinct dynamic to the group’s interactions, especially during train-related activities and discussions. Kinako also enriches the documentation of the various railway stations and lines the group visits.