Rin Jandara is a supporting character introduced in the second season. Hailing from the Mikawa area of Aichi Prefecture, she attends Tagane High School, likely as a 17-year-old second-year student. Her personality is serious and studious, with reading as her primary hobby.

She possesses extensive knowledge of Mikawa's regional history. This expertise accompanies a notable dissatisfaction that Mikawa was incorporated into Aichi Prefecture instead of retaining its independent identity as the former Nukata Prefecture, reflecting a distinct regional perspective.

Her relationship to the character Teppei positions her as his senior (senpai). Rin initially appears at the conclusion of the second season's first episode, followed by additional brief appearances later in that season.