Kodama Orihara is a third-year university student who serves as the president of the Railway Travel Club, known as the Tetsuryōkai. She naturally takes on a reliable older‑sister role within the group, offering steady guidance and support to the other members. She is especially patient with Misaki Sada, a first‑year student who is new to railways, and takes the time to teach her about trains and stations. She also looks after Ushio Yagami, who often oversleeps and needs to be woken up for club activities. Kodama’s passion for railways is the strongest of anyone in the club; she is a genuine enthusiast who becomes completely absorbed whenever the topic comes up, sometimes getting so excited that she loses track of the conversation. This deep love for trains motivates her to share her knowledge and enthusiasm with others, making her the driving force behind the club’s travels and explorations. Her role in the story centers on leading the group to various stations and encounters with characters from the Tetsudō Musume franchise, while also helping her fellow members, especially the newcomers, develop their own interest in railways. Although the anime has not yet aired, her established personality as a caring yet fervent leader suggests that she will play a key part in the group’s growth and adventures. Her notable abilities include extensive knowledge of railway systems, routes, and local train culture, which she applies readily during the club’s trips.